src

src/.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

src/.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

src/.idea/.name

@@ -0,0 +1 @@
+XiaoMI-Note

src/.idea/AndroidProjectSystem.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AndroidProjectSystem">
+    <option name="providerId" value="com.android.tools.idea.GradleProjectSystem" />
+  </component>
+</project>

src/.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="21" />
+  </component>
+</project>

src/.idea/deploymentTargetSelector.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetSelector">
+    <selectionStates>
+      <SelectionState runConfigName="app">
+        <option name="selectionMode" value="DROPDOWN" />
+        <DropdownSelection timestamp="2025-03-24T05:28:02.754207300Z">
+          <Target type="DEFAULT_BOOT">
+            <handle>
+              <DeviceId pluginId="LocalEmulator" identifier="path=C:\Users\86187\.android\avd\Pixel_9_Pro.avd" />
+            </handle>
+          </Target>
+        </DropdownSelection>
+        <DialogSelection />
+      </SelectionState>
+    </selectionStates>
+  </component>
+</project>

src/.idea/gradle.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="CHOOSE_PER_TEST" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

src/.idea/migrations.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectMigrations">
+    <option name="MigrateToGradleLocalJavaHome">
+      <set>
+        <option value="$PROJECT_DIR$" />
+      </set>
+    </option>
+  </component>
+</project>

src/.idea/misc.xml

@@ -0,0 +1,9 @@
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

src/.idea/runConfigurations.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.intellij.execution.junit.AbstractAllInDirectoryConfigurationProducer" />
+        <option value="com.intellij.execution.junit.AllInPackageConfigurationProducer" />
+        <option value="com.intellij.execution.junit.PatternConfigurationProducer" />
+        <option value="com.intellij.execution.junit.TestInClassConfigurationProducer" />
+        <option value="com.intellij.execution.junit.UniqueIdConfigurationProducer" />
+        <option value="com.intellij.execution.junit.testDiscovery.JUnitTestDiscoveryConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinJUnitRunConfigurationProducer" />
+        <option value="org.jetbrains.kotlin.idea.junit.KotlinPatternConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

src/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

src/app/.gitignore

@@ -0,0 +1 @@
+/build

src/app/build.gradle.kts

@@ -0,0 +1,61 @@
+plugins {
+    alias(libs.plugins.android.application)
+}
+
+android {
+    namespace = "net.micode.xiaomi_note"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "net.micode.xiaomi_note"
+        minSdk = 24
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+
+    packaging {
+        resources.excludes.add("META-INF/DEPENDENCIES");
+        resources.excludes.add("META-INF/NOTICE");
+        resources.excludes.add("META-INF/LICENSE");
+        resources.excludes.add("META-INF/LICENSE.txt");
+        resources.excludes.add("META-INF/NOTICE.txt");
+    }
+}
+
+dependencies {
+
+    implementation(libs.appcompat)
+    implementation(libs.material)
+    implementation(libs.activity)
+    implementation(libs.constraintlayout)
+
+//    implementation(fileTree(mapOf(
+//        "dir" to "D:\\Code\\AndroidCode\\Notesmaster\\httpcomponents-client-4.5.14-bin\\lib",
+//        "include" to listOf("*.aar", "*.jar"),
+//        "exclude" to listOf("")
+//    )))
+    //修改为如下代码：
+    implementation(files("E:/android/Notes/httpcomponents-client-4.5.14-bin/httpcomponents-client-4.5.14-bin/lib/httpclient-osgi-4.5.14.jar"))
+    implementation(files("E:/android/Notes/httpcomponents-client-4.5.14-bin/httpcomponents-client-4.5.14-bin/lib/httpclient-win-4.5.14.jar"))
+    implementation(files("E:/android/Notes/httpcomponents-client-4.5.14-bin/httpcomponents-client-4.5.14-bin/lib/httpcore-4.4.16.jar"))
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+}

src/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

src/app/src/androidTest/java/net/micode/xiaomi_note/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package net.micode.xiaomi_note;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("net.micode.xiaomi_note", appContext.getPackageName());
+    }
+}

src/app/src/main/AndroidManifest.xml

@@ -0,0 +1,154 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_CONTACTS" />
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.USE_CREDENTIALS" />
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="XiaoMI-Note"
+        android:roundIcon="@mipmap/ic_launcher"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Notesmaster"
+        tools:targetApi="31">
+
+        <activity
+            android:name="net.micode.xiaomi_note.ui.NotesListActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize"
+            android:label="@string/app_name"
+            android:launchMode="singleTop"
+            android:theme="@style/NoteTheme"
+            android:uiOptions="splitActionBarWhenNarrow"
+            android:windowSoftInputMode="adjustPan"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+                <data android:mimeType="vnd.android.cursor.item/text_note" />
+            </intent-filter>
+        </activity>
+
+        <activity
+            android:name=".ui.NoteEditActivity"
+            android:configChanges="keyboardHidden|orientation|screenSize"
+            android:launchMode="singleTop"
+            android:theme="@style/NoteTheme"
+            android:exported="true">
+
+            <intent-filter >
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="vnd.android.cursor.item/text_note" />
+                <data android:mimeType="vnd.android.cursor.item/call_note" />
+            </intent-filter >
+
+            <intent-filter >
+                <action android:name="android.intent.action.INSERT_OR_EDIT" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <data android:mimeType="vnd.android.cursor.item/text_note" />
+                <data android:mimeType="vnd.android.cursor.item/call_note" />
+            </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.SEARCH" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.app.searchable"
+                android:resource="@xml/searchable" />
+        </activity>
+
+
+        <provider
+            android:name="net.micode.xiaomi_note.data.NotesProvider"
+            android:exported="false"
+            android:authorities="micode_notes"
+            android:multiprocess="true" />
+
+        <receiver
+            android:name=".widget.NoteWidgetProvider_2x"
+            android:label="@string/app_widget2x2"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_2x_info" />
+        </receiver>
+        <receiver
+            android:name=".widget.NoteWidgetProvider_4x"
+            android:label="@string/app_widget4x4"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/widget_4x_info" />
+        </receiver>
+
+        <receiver android:name=".ui.AlarmInitReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+            </intent-filter>
+        </receiver>
+
+        <activity
+            android:name=".ui.AlarmAlertActivity"
+            android:label="@string/app_name"
+            android:launchMode="singleInstance"
+            android:theme="@android:style/Theme.Holo.Wallpaper.NoTitleBar" >
+        </activity>
+
+        <activity
+            android:name="net.micode.xiaomi_note.MainActivity"
+            android:label="@string/preferences_title"
+            android:launchMode="singleTop"
+            android:theme="@android:style/Theme.Holo.Light" >
+        </activity>
+
+        <service
+            android:name="net.micode.xiaomi_note.gtask.remote.GTaskSyncService"
+            android:exported="false" >
+        </service>
+
+        <meta-data
+            android:name="android.app.default_searchable"
+            android:value=".ui.NoteEditActivity" />
+
+        <!--        <activity-->
+        <!--            android:name=".MainActivity"-->
+        <!--            android:exported="true">-->
+        <!--            <intent-filter>-->
+        <!--                <action android:name="android.intent.action.MAIN" />-->
+
+        <!--                <category android:name="android.intent.category.LAUNCHER" />-->
+        <!--            </intent-filter>-->
+        <!--        </activity>-->
+
+    </application>
+
+</manifest>

src/app/src/main/java/net/micode/xiaomi_note/MainActivity.java

@@ -0,0 +1,26 @@
+package net.micode.xiaomi_note;
+
+import android.os.Bundle;
+
+import androidx.activity.EdgeToEdge; // 提供边缘到边缘显示的支持类
+import androidx.appcompat.app.AppCompatActivity; // AndroidX提供的Activity基类
+import androidx.core.graphics.Insets; // 用于处理窗口内边距的工具类
+import androidx.core.view.ViewCompat; // 提供视图相关的兼容性API
+import androidx.core.view.WindowInsetsCompat; // 窗口装饰区域的兼容性API
+
+public class MainActivity extends AppCompatActivity { // 主活动类，继承自AppCompatActivity
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) { // 活动创建时调用的方法
+        super.onCreate(savedInstanceState); // 调用父类方法完成基本初始化
+        EdgeToEdge.enable(this); // 启用边缘到边缘显示模式
+        setContentView(R.layout.activity_main); // 设置当前活动的布局文件
+        ViewCompat.setOnApplyWindowInsetsListener( // 为视图设置窗口装饰区域监听器
+                findViewById(R.id.main), // 获取ID为"main"的视图
+                (v, insets) -> { // 定义窗口装饰区域监听器的回调函数
+                    Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()); // 获取系统栏（如状态栏、导航栏）的内边距
+                    v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom); // 设置视图的填充以适配系统栏
+                    return insets; // 返回处理后的窗口装饰区域信息
+                });
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/data/Contact.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.data;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.provider.ContactsContract.CommonDataKinds.Phone;
+import android.provider.ContactsContract.Data;
+import android.telephony.PhoneNumberUtils;
+import android.util.Log;
+
+import java.util.HashMap;
+
+public class Contact {
+    private static HashMap<String, String> sContactCache;
+    private static final String TAG = "Contact";
+
+    private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
+    + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
+    + " AND " + Data.RAW_CONTACT_ID + " IN "
+            + "(SELECT raw_contact_id "
+            + " FROM phone_lookup"
+            + " WHERE min_match = '+')";
+
+    public static String getContact(Context context, String phoneNumber) {
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },
+                selection,
+                new String[] { phoneNumber },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name);
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                cursor.close();
+            }
+        } else {
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/data/Notes.java

@@ -0,0 +1,279 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.data;
+
+import android.net.Uri;
+public class Notes {
+    public static final String AUTHORITY = "micode_notes";
+    public static final String TAG = "Notes";
+    public static final int TYPE_NOTE     = 0;
+    public static final int TYPE_FOLDER   = 1;
+    public static final int TYPE_SYSTEM   = 2;
+
+    /**
+     * Following IDs are system folders' identifiers
+     * {@link Notes#ID_ROOT_FOLDER } is default folder
+     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
+     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
+     */
+    public static final int ID_ROOT_FOLDER = 0;
+    public static final int ID_TEMPARAY_FOLDER = -1;
+    public static final int ID_CALL_RECORD_FOLDER = -2;
+    public static final int ID_TRASH_FOLER = -3;
+
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
+
+    public static final int TYPE_WIDGET_INVALIDE      = -1;
+    public static final int TYPE_WIDGET_2X            = 0;
+    public static final int TYPE_WIDGET_4X            = 1;
+
+    public static class DataConstants {
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+    }
+
+    /**
+     * Uri to query all notes and folders
+     */
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    /**
+     * Uri to query data
+     */
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    public interface NoteColumns {
+        /**
+         * The unique ID for a row
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * The parent's id for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String PARENT_ID = "parent_id";
+
+        /**
+         * Created data for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * Latest modified date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+
+        /**
+         * Alert date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ALERTED_DATE = "alert_date";
+
+        /**
+         * Folder's name or text content of note
+         * <P> Type: TEXT </P>
+         */
+        public static final String SNIPPET = "snippet";
+
+        /**
+         * Note's widget id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String WIDGET_ID = "widget_id";
+
+        /**
+         * Note's widget type
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String WIDGET_TYPE = "widget_type";
+
+        /**
+         * Note's background color's id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        /**
+         * For text note, it doesn't has attachment, for multi-media
+         * note, it has at least one attachment
+         * <P> Type: INTEGER </P>
+         */
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        /**
+         * Folder's count of notes
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String NOTES_COUNT = "notes_count";
+
+        /**
+         * The file type: folder or note
+         * <P> Type: INTEGER </P>
+         */
+        public static final String TYPE = "type";
+
+        /**
+         * The last sync id
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String SYNC_ID = "sync_id";
+
+        /**
+         * Sign to indicate local modified or not
+         * <P> Type: INTEGER </P>
+         */
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        /**
+         * Original parent id before moving into temporary folder
+         * <P> Type : INTEGER </P>
+         */
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        /**
+         * The gtask id
+         * <P> Type : TEXT </P>
+         */
+        public static final String GTASK_ID = "gtask_id";
+
+        /**
+         * The version code
+         * <P> Type : INTEGER (long) </P>
+         */
+        public static final String VERSION = "version";
+    }
+
+    public interface DataColumns {
+        /**
+         * The unique ID for a row
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String ID = "_id";
+
+        /**
+         * The MIME type of the item represented by this row.
+         * <P> Type: Text </P>
+         */
+        public static final String MIME_TYPE = "mime_type";
+
+        /**
+         * The reference id to note that this data belongs to
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String NOTE_ID = "note_id";
+
+        /**
+         * Created data for note or folder
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CREATED_DATE = "created_date";
+
+        /**
+         * Latest modified date
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String MODIFIED_DATE = "modified_date";
+
+        /**
+         * Data's content
+         * <P> Type: TEXT </P>
+         */
+        public static final String CONTENT = "content";
+
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * integer data type
+         * <P> Type: INTEGER </P>
+         */
+        public static final String DATA1 = "data1";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * integer data type
+         * <P> Type: INTEGER </P>
+         */
+        public static final String DATA2 = "data2";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA3 = "data3";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA4 = "data4";
+
+        /**
+         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+         * TEXT data type
+         * <P> Type: TEXT </P>
+         */
+        public static final String DATA5 = "data5";
+    }
+
+    public static final class TextNote implements DataColumns {
+        /**
+         * Mode to indicate the text in check list mode or not
+         * <P> Type: Integer 1:check list mode 0: normal mode </P>
+         */
+        public static final String MODE = DATA1;
+
+        public static final int MODE_CHECK_LIST = 1;
+
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
+
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
+    }
+
+    public static final class CallNote implements DataColumns {
+        /**
+         * Call date for this record
+         * <P> Type: INTEGER (long) </P>
+         */
+        public static final String CALL_DATE = DATA1;
+
+        /**
+         * Phone number for this record
+         * <P> Type: TEXT </P>
+         */
+        public static final String PHONE_NUMBER = DATA3;
+
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
+
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/data/NotesDatabaseHelper.java

@@ -0,0 +1,362 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.data;
+
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.DataConstants;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+
+
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    private static final String DB_NAME = "note.db";
+
+    private static final int DB_VERSION = 4;
+
+    public interface TABLE {
+        public static final String NOTE = "note";
+
+        public static final String DATA = "data";
+    }
+
+    private static final String TAG = "NotesDatabaseHelper";
+
+    private static NotesDatabaseHelper mInstance;
+
+    private static final String CREATE_NOTE_TABLE_SQL =
+        "CREATE TABLE " + TABLE.NOTE + "(" +
+            NoteColumns.ID + " INTEGER PRIMARY KEY," +
+            NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
+            NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
+        ")";
+
+    private static final String CREATE_DATA_TABLE_SQL =
+        "CREATE TABLE " + TABLE.DATA + "(" +
+            DataColumns.ID + " INTEGER PRIMARY KEY," +
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," +
+            DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA1 + " INTEGER," +
+            DataColumns.DATA2 + " INTEGER," +
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
+        ")";
+
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /**
+     * Increase folder's note count when move note to the folder
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_update "+
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    /**
+     * Decrease folder's note count when move note from folder
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_update " +
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
+        " END";
+
+    /**
+     * Increase folder's note count when insert new note to the folder
+     */
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_insert " +
+        " AFTER INSERT ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    /**
+     * Decrease folder's note count when delete note from the folder
+     */
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0;" +
+        " END";
+
+    /**
+     * Update note's content when insert data with type {@link DataConstants#NOTE}
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_insert " +
+        " AFTER INSERT ON " + TABLE.DATA +
+        " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has changed
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_update " +
+        " AFTER UPDATE ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
+     */
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_delete " +
+        " AFTER delete ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=''" +
+        "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    /**
+     * Delete datas belong to note which has been deleted
+     */
+    private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER delete_data_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.DATA +
+        "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    /**
+     * Delete notes belong to folder which has been deleted
+     */
+    private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER folder_delete_notes_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.NOTE +
+        "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    /**
+     * Move notes belong to folder which has been moved to trash folder
+     */
+    private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
+        "CREATE TRIGGER folder_move_notes_on_trash " +
+        " AFTER UPDATE ON " + TABLE.NOTE +
+        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    public NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL);
+        reCreateNoteTableTriggers(db);
+        createSystemFolder(db);
+        Log.d(TAG, "note table has been created");
+    }
+
+    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
+
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
+        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
+        db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
+    }
+
+    private void createSystemFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+
+        /**
+         * call record foler for call notes
+         */
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * root folder which is default folder
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * temporary folder which is used for moving note
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        /**
+         * create trash folder
+         */
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    public void createDataTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_DATA_TABLE_SQL);
+        reCreateDataTableTriggers(db);
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
+        Log.d(TAG, "data table has been created");
+    }
+
+    private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
+
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
+    }
+
+    static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        boolean reCreateTriggers = false;
+        boolean skipV2 = false;
+
+        if (oldVersion == 1) {
+            upgradeToV2(db);
+            skipV2 = true; // this upgrade including the upgrade from v2 to v3
+            oldVersion++;
+        }
+
+        if (oldVersion == 2 && !skipV2) {
+            upgradeToV3(db);
+            reCreateTriggers = true;
+            oldVersion++;
+        }
+
+        if (oldVersion == 3) {
+            upgradeToV4(db);
+            oldVersion++;
+        }
+
+        if (reCreateTriggers) {
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+        }
+
+        if (oldVersion != newVersion) {
+            throw new IllegalStateException("Upgrade notes database to version " + newVersion
+                    + "fails");
+        }
+    }
+
+    private void upgradeToV2(SQLiteDatabase db) {
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
+        createNoteTable(db);
+        createDataTable(db);
+    }
+
+    private void upgradeToV3(SQLiteDatabase db) {
+        // drop unused triggers
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
+        // add a column for gtask id
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
+                + " TEXT NOT NULL DEFAULT ''");
+        // add a trash system folder
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    private void upgradeToV4(SQLiteDatabase db) {
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
+                + " INTEGER NOT NULL DEFAULT 0");
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/data/NotesProvider.java

@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.data;
+
+
+import android.app.SearchManager;
+import android.content.ContentProvider;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Intent;
+import android.content.UriMatcher;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.net.Uri;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.data.NotesDatabaseHelper.TABLE;
+
+
+public class NotesProvider extends ContentProvider {
+    private static final UriMatcher mMatcher;
+
+    private NotesDatabaseHelper mHelper;
+
+    private static final String TAG = "NotesProvider";
+
+    private static final int URI_NOTE            = 1;
+    private static final int URI_NOTE_ITEM       = 2;
+    private static final int URI_DATA            = 3;
+    private static final int URI_DATA_ITEM       = 4;
+
+    private static final int URI_SEARCH          = 5;
+    private static final int URI_SEARCH_SUGGEST  = 6;
+
+    static {
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+    }
+
+    /**
+     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
+     * we will trim '\n' and white space in order to show more information.
+     */
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+        + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+        + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+        + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+        + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+        + " FROM " + TABLE.NOTE
+        + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+        + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+        + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+
+    @Override
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+            String sortOrder) {
+        Cursor c = null;
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA:
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_SEARCH:
+            case URI_SEARCH_SUGGEST:
+                if (sortOrder != null || projection != null) {
+                    throw new IllegalArgumentException(
+                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                }
+
+                String searchString = null;
+                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    if (uri.getPathSegments().size() > 1) {
+                        searchString = uri.getPathSegments().get(1);
+                    }
+                } else {
+                    searchString = uri.getQueryParameter("pattern");
+                }
+
+                if (TextUtils.isEmpty(searchString)) {
+                    return null;
+                }
+
+                try {
+                    searchString = String.format("%%%s%%", searchString);
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
+                            new String[] { searchString });
+                } catch (IllegalStateException ex) {
+                    Log.e(TAG, "got exception: " + ex.toString());
+                }
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
+                break;
+            case URI_DATA:
+                if (values.containsKey(DataColumns.NOTE_ID)) {
+                    noteId = values.getAsLong(DataColumns.NOTE_ID);
+                } else {
+                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                }
+                insertedId = dataId = db.insert(TABLE.DATA, null, values);
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        // Notify the note uri
+        if (noteId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+        }
+
+        // Notify the data uri
+        if (dataId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        }
+
+        return ContentUris.withAppendedId(uri, insertedId);
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                /**
+                 * ID that smaller than 0 is system folder which is not allowed to
+                 * trash
+                 */
+                long noteId = Long.valueOf(id);
+                if (noteId <= 0) {
+                    break;
+                }
+                count = db.delete(TABLE.NOTE,
+                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                deleteData = true;
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                count = db.delete(TABLE.DATA,
+                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                deleteData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (count > 0) {
+            if (deleteData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        int count = 0;
+        String id = null;
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean updateData = false;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                increaseNoteVersion(-1, selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                count = db.update(TABLE.DATA, values, selection, selectionArgs);
+                updateData = true;
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs);
+                updateData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+
+        if (count > 0) {
+            if (updateData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    private String parseSelection(String selection) {
+        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    }
+
+    private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
+        StringBuilder sql = new StringBuilder(120);
+        sql.append("UPDATE ");
+        sql.append(TABLE.NOTE);
+        sql.append(" SET ");
+        sql.append(NoteColumns.VERSION);
+        sql.append("=" + NoteColumns.VERSION + "+1 ");
+
+        if (id > 0 || !TextUtils.isEmpty(selection)) {
+            sql.append(" WHERE ");
+        }
+        if (id > 0) {
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+        }
+        if (!TextUtils.isEmpty(selection)) {
+            String selectString = id > 0 ? parseSelection(selection) : selection;
+            for (String args : selectionArgs) {
+                selectString = selectString.replaceFirst("\\?", args);
+            }
+            sql.append(selectString);
+        }
+
+        mHelper.getWritableDatabase().execSQL(sql.toString());
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/MetaData.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class MetaData extends Task {
+    private final static String TAG = MetaData.class.getSimpleName();
+
+    private String mRelatedGid = null;
+
+    public void setMeta(String gid, JSONObject metaInfo) {
+        try {
+            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
+        } catch (JSONException e) {
+            Log.e(TAG, "failed to put related gid");
+        }
+        setNotes(metaInfo.toString());
+        setName(GTaskStringUtils.META_NOTE_NAME);
+    }
+
+    public String getRelatedGid() {
+        return mRelatedGid;
+    }
+
+    @Override
+    public boolean isWorthSaving() {
+        return getNotes() != null;
+    }
+
+    @Override
+    public void setContentByRemoteJSON(JSONObject js) {
+        super.setContentByRemoteJSON(js);
+        if (getNotes() != null) {
+            try {
+                JSONObject metaInfo = new JSONObject(getNotes().trim());
+                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
+            } catch (JSONException e) {
+                Log.w(TAG, "failed to get related gid");
+                mRelatedGid = null;
+            }
+        }
+    }
+
+    @Override
+    public void setContentByLocalJSON(JSONObject js) {
+        // this function should not be called
+        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
+    }
+
+    @Override
+    public JSONObject getLocalJSONFromContent() {
+        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
+    }
+
+    @Override
+    public int getSyncAction(Cursor c) {
+        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/Node.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.database.Cursor;
+
+import org.json.JSONObject;
+
+public abstract class Node {
+    public static final int SYNC_ACTION_NONE = 0;
+
+    public static final int SYNC_ACTION_ADD_REMOTE = 1;
+
+    public static final int SYNC_ACTION_ADD_LOCAL = 2;
+
+    public static final int SYNC_ACTION_DEL_REMOTE = 3;
+
+    public static final int SYNC_ACTION_DEL_LOCAL = 4;
+
+    public static final int SYNC_ACTION_UPDATE_REMOTE = 5;
+
+    public static final int SYNC_ACTION_UPDATE_LOCAL = 6;
+
+    public static final int SYNC_ACTION_UPDATE_CONFLICT = 7;
+
+    public static final int SYNC_ACTION_ERROR = 8;
+
+    private String mGid;
+
+    private String mName;
+
+    private long mLastModified;
+
+    private boolean mDeleted;
+
+    public Node() {
+        mGid = null;
+        mName = "";
+        mLastModified = 0;
+        mDeleted = false;
+    }
+
+    public abstract JSONObject getCreateAction(int actionId);
+
+    public abstract JSONObject getUpdateAction(int actionId);
+
+    public abstract void setContentByRemoteJSON(JSONObject js);
+
+    public abstract void setContentByLocalJSON(JSONObject js);
+
+    public abstract JSONObject getLocalJSONFromContent();
+
+    public abstract int getSyncAction(Cursor c);
+
+    public void setGid(String gid) {
+        this.mGid = gid;
+    }
+
+    public void setName(String name) {
+        this.mName = name;
+    }
+
+    public void setLastModified(long lastModified) {
+        this.mLastModified = lastModified;
+    }
+
+    public void setDeleted(boolean deleted) {
+        this.mDeleted = deleted;
+    }
+
+    public String getGid() {
+        return this.mGid;
+    }
+
+    public String getName() {
+        return this.mName;
+    }
+
+    public long getLastModified() {
+        return this.mLastModified;
+    }
+
+    public boolean getDeleted() {
+        return this.mDeleted;
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/SqlData.java

@@ -0,0 +1,189 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.DataConstants;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.data.NotesDatabaseHelper.TABLE;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class SqlData {
+    private static final String TAG = SqlData.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;
+
+    public static final String[] PROJECTION_DATA = new String[] {
+            DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
+            DataColumns.DATA3
+    };
+
+    public static final int DATA_ID_COLUMN = 0;
+
+    public static final int DATA_MIME_TYPE_COLUMN = 1;
+
+    public static final int DATA_CONTENT_COLUMN = 2;
+
+    public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
+
+    public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mIsCreate;
+
+    private long mDataId;
+
+    private String mDataMimeType;
+
+    private String mDataContent;
+
+    private long mDataContentData1;
+
+    private String mDataContentData3;
+
+    private ContentValues mDiffDataValues;
+
+    public SqlData(Context context) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mDataId = INVALID_ID;
+        mDataMimeType = DataConstants.NOTE;
+        mDataContent = "";
+        mDataContentData1 = 0;
+        mDataContentData3 = "";
+        mDiffDataValues = new ContentValues();
+    }
+
+    public SqlData(Context context, Cursor c) {
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDiffDataValues = new ContentValues();
+    }
+
+    private void loadFromCursor(Cursor c) {
+        mDataId = c.getLong(DATA_ID_COLUMN);
+        mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
+        mDataContent = c.getString(DATA_CONTENT_COLUMN);
+        mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
+        mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
+    }
+
+    public void setContent(JSONObject js) throws JSONException {
+        long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
+        if (mIsCreate || mDataId != dataId) {
+            mDiffDataValues.put(DataColumns.ID, dataId);
+        }
+        mDataId = dataId;
+
+        String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
+                : DataConstants.NOTE;
+        if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
+            mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
+        }
+        mDataMimeType = dataMimeType;
+
+        String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
+        if (mIsCreate || !mDataContent.equals(dataContent)) {
+            mDiffDataValues.put(DataColumns.CONTENT, dataContent);
+        }
+        mDataContent = dataContent;
+
+        long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
+        if (mIsCreate || mDataContentData1 != dataContentData1) {
+            mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
+        }
+        mDataContentData1 = dataContentData1;
+
+        String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
+        if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
+            mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
+        }
+        mDataContentData3 = dataContentData3;
+    }
+
+    public JSONObject getContent() throws JSONException {
+        if (mIsCreate) {
+            Log.e(TAG, "it seems that we haven't created this in database yet");
+            return null;
+        }
+        JSONObject js = new JSONObject();
+        js.put(DataColumns.ID, mDataId);
+        js.put(DataColumns.MIME_TYPE, mDataMimeType);
+        js.put(DataColumns.CONTENT, mDataContent);
+        js.put(DataColumns.DATA1, mDataContentData1);
+        js.put(DataColumns.DATA3, mDataContentData3);
+        return js;
+    }
+
+    public void commit(long noteId, boolean validateVersion, long version) {
+
+        if (mIsCreate) {
+            if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
+                mDiffDataValues.remove(DataColumns.ID);
+            }
+
+            mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
+            Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
+            try {
+                mDataId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+        } else {
+            if (mDiffDataValues.size() > 0) {
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
+                } else {
+                    result = mContentResolver.update(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
+                            " ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+                                    + " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
+                                    String.valueOf(noteId), String.valueOf(version)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+        }
+
+        mDiffDataValues.clear();
+        mIsCreate = false;
+    }
+
+    public long getId() {
+        return mDataId;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/SqlNote.java

@@ -0,0 +1,505 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+import net.micode.xiaomi_note.tool.ResourceParser;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class SqlNote {
+    private static final String TAG = SqlNote.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;
+
+    public static final String[] PROJECTION_NOTE = new String[] {
+            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
+            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
+            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
+            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
+            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
+            NoteColumns.VERSION
+    };
+
+    public static final int ID_COLUMN = 0;
+
+    public static final int ALERTED_DATE_COLUMN = 1;
+
+    public static final int BG_COLOR_ID_COLUMN = 2;
+
+    public static final int CREATED_DATE_COLUMN = 3;
+
+    public static final int HAS_ATTACHMENT_COLUMN = 4;
+
+    public static final int MODIFIED_DATE_COLUMN = 5;
+
+    public static final int NOTES_COUNT_COLUMN = 6;
+
+    public static final int PARENT_ID_COLUMN = 7;
+
+    public static final int SNIPPET_COLUMN = 8;
+
+    public static final int TYPE_COLUMN = 9;
+
+    public static final int WIDGET_ID_COLUMN = 10;
+
+    public static final int WIDGET_TYPE_COLUMN = 11;
+
+    public static final int SYNC_ID_COLUMN = 12;
+
+    public static final int LOCAL_MODIFIED_COLUMN = 13;
+
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
+
+    public static final int GTASK_ID_COLUMN = 15;
+
+    public static final int VERSION_COLUMN = 16;
+
+    private Context mContext;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mIsCreate;
+
+    private long mId;
+
+    private long mAlertDate;
+
+    private int mBgColorId;
+
+    private long mCreatedDate;
+
+    private int mHasAttachment;
+
+    private long mModifiedDate;
+
+    private long mParentId;
+
+    private String mSnippet;
+
+    private int mType;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mOriginParent;
+
+    private long mVersion;
+
+    private ContentValues mDiffNoteValues;
+
+    private ArrayList<SqlData> mDataList;
+
+    public SqlNote(Context context) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = true;
+        mId = INVALID_ID;
+        mAlertDate = 0;
+        mBgColorId = ResourceParser.getDefaultBgId(context);
+        mCreatedDate = System.currentTimeMillis();
+        mHasAttachment = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mParentId = 0;
+        mSnippet = "";
+        mType = Notes.TYPE_NOTE;
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+        mOriginParent = 0;
+        mVersion = 0;
+        mDiffNoteValues = new ContentValues();
+        mDataList = new ArrayList<SqlData>();
+    }
+
+    public SqlNote(Context context, Cursor c) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(c);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+    }
+
+    public SqlNote(Context context, long id) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        mIsCreate = false;
+        loadFromCursor(id);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+
+    }
+
+    private void loadFromCursor(long id) {
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(id)
+                    }, null);
+            if (c != null) {
+                c.moveToNext();
+                loadFromCursor(c);
+            } else {
+                Log.w(TAG, "loadFromCursor: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    private void loadFromCursor(Cursor c) {
+        mId = c.getLong(ID_COLUMN);
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
+        mParentId = c.getLong(PARENT_ID_COLUMN);
+        mSnippet = c.getString(SNIPPET_COLUMN);
+        mType = c.getInt(TYPE_COLUMN);
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
+        mVersion = c.getLong(VERSION_COLUMN);
+    }
+
+    private void loadDataContent() {
+        Cursor c = null;
+        mDataList.clear();
+        try {
+            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
+                    "(note_id=?)", new String[] {
+                        String.valueOf(mId)
+                    }, null);
+            if (c != null) {
+                if (c.getCount() == 0) {
+                    Log.w(TAG, "it seems that the note has not data");
+                    return;
+                }
+                while (c.moveToNext()) {
+                    SqlData data = new SqlData(mContext, c);
+                    mDataList.add(data);
+                }
+            } else {
+                Log.w(TAG, "loadDataContent: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    public boolean setContent(JSONObject js) {
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                Log.w(TAG, "cannot set system folder");
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                // for folder we can only update the snnipet and type
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
+                if (mIsCreate || mId != id) {
+                    mDiffNoteValues.put(NoteColumns.ID, id);
+                }
+                mId = id;
+
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
+                        .getLong(NoteColumns.ALERTED_DATE) : 0;
+                if (mIsCreate || mAlertDate != alertDate) {
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                }
+                mAlertDate = alertDate;
+
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
+                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
+                if (mIsCreate || mBgColorId != bgColorId) {
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
+                }
+                mBgColorId = bgColorId;
+
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
+                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mCreatedDate != createDate) {
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                }
+                mCreatedDate = createDate;
+
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
+                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
+                if (mIsCreate || mHasAttachment != hasAttachment) {
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                }
+                mHasAttachment = hasAttachment;
+
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
+                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mModifiedDate != modifiedDate) {
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                }
+                mModifiedDate = modifiedDate;
+
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note
+                        .getLong(NoteColumns.PARENT_ID) : 0;
+                if (mIsCreate || mParentId != parentId) {
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                }
+                mParentId = parentId;
+
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
+                        : AppWidgetManager.INVALID_APPWIDGET_ID;
+                if (mIsCreate || mWidgetId != widgetId) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
+                }
+                mWidgetId = widgetId;
+
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
+                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
+                if (mIsCreate || mWidgetType != widgetType) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
+                }
+                mWidgetType = widgetType;
+
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
+                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
+                if (mIsCreate || mOriginParent != originParent) {
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
+                }
+                mOriginParent = originParent;
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    SqlData sqlData = null;
+                    if (data.has(DataColumns.ID)) {
+                        long dataId = data.getLong(DataColumns.ID);
+                        for (SqlData temp : mDataList) {
+                            if (dataId == temp.getId()) {
+                                sqlData = temp;
+                            }
+                        }
+                    }
+
+                    if (sqlData == null) {
+                        sqlData = new SqlData(mContext);
+                        mDataList.add(sqlData);
+                    }
+
+                    sqlData.setContent(data);
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        }
+        return true;
+    }
+
+    public JSONObject getContent() {
+        try {
+            JSONObject js = new JSONObject();
+
+            if (mIsCreate) {
+                Log.e(TAG, "it seems that we haven't created this in database yet");
+                return null;
+            }
+
+            JSONObject note = new JSONObject();
+            if (mType == Notes.TYPE_NOTE) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
+                note.put(NoteColumns.PARENT_ID, mParentId);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.WIDGET_ID, mWidgetId);
+                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
+                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+
+                JSONArray dataArray = new JSONArray();
+                for (SqlData sqlData : mDataList) {
+                    JSONObject data = sqlData.getContent();
+                    if (data != null) {
+                        dataArray.put(data);
+                    }
+                }
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+            }
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public void setParentId(long id) {
+        mParentId = id;
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+    }
+
+    public void setGtaskId(String gid) {
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+    }
+
+    public void setSyncId(long syncId) {
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+    }
+
+    public void resetLocalModified() {
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public long getParentId() {
+        return mParentId;
+    }
+
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    public boolean isNoteType() {
+        return mType == Notes.TYPE_NOTE;
+    }
+
+    public void commit(boolean validateVersion) {
+        if (mIsCreate) {
+            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
+                mDiffNoteValues.remove(NoteColumns.ID);
+            }
+
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            try {
+                mId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+            if (mId == 0) {
+                throw new IllegalStateException("Create thread id failed");
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, false, -1);
+                }
+            }
+        } else {
+            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
+                Log.e(TAG, "No such note");
+                throw new IllegalStateException("Try to update note with invalid id");
+            }
+            if (mDiffNoteValues.size() > 0) {
+                mVersion ++;
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?)", new String[] {
+                        String.valueOf(mId)
+                    });
+                } else {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
+                            new String[] {
+                                    String.valueOf(mId), String.valueOf(mVersion)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, validateVersion, mVersion);
+                }
+            }
+        }
+
+        // refresh local info
+        loadFromCursor(mId);
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+
+        mDiffNoteValues.clear();
+        mIsCreate = false;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/Task.java

@@ -0,0 +1,351 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.DataConstants;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+
+public class Task extends Node {
+    private static final String TAG = Task.class.getSimpleName();
+
+    private boolean mCompleted;
+
+    private String mNotes;
+
+    private JSONObject mMetaInfo;
+
+    private Task mPriorSibling;
+
+    private TaskList mParent;
+
+    public Task() {
+        super();
+        mCompleted = false;
+        mNotes = null;
+        mPriorSibling = null;
+        mParent = null;
+        mMetaInfo = null;
+    }
+
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this));
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_TASK);
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+            // parent_id
+            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
+
+            // dest_parent_type
+            js.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+
+            // list_id
+            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
+
+            // prior_sibling_id
+            if (mPriorSibling != null) {
+                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-create jsonobject");
+        }
+
+        return js;
+    }
+
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            if (getNotes() != null) {
+                entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
+            }
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate task-update jsonobject");
+        }
+
+        return js;
+    }
+
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+                // notes
+                if (js.has(GTaskStringUtils.GTASK_JSON_NOTES)) {
+                    setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));
+                }
+
+                // deleted
+                if (js.has(GTaskStringUtils.GTASK_JSON_DELETED)) {
+                    setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED));
+                }
+
+                // completed
+                if (js.has(GTaskStringUtils.GTASK_JSON_COMPLETED)) {
+                    setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED));
+                }
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get task content from jsonobject");
+            }
+        }
+    }
+
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)
+                || !js.has(GTaskStringUtils.META_HEAD_DATA)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) {
+                Log.e(TAG, "invalid type");
+                return;
+            }
+
+            for (int i = 0; i < dataArray.length(); i++) {
+                JSONObject data = dataArray.getJSONObject(i);
+                if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                    setName(data.getString(DataColumns.CONTENT));
+                    break;
+                }
+            }
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    public JSONObject getLocalJSONFromContent() {
+        String name = getName();
+        try {
+            if (mMetaInfo == null) {
+                // new task created from web
+                if (name == null) {
+                    Log.w(TAG, "the note seems to be an empty one");
+                    return null;
+                }
+
+                JSONObject js = new JSONObject();
+                JSONObject note = new JSONObject();
+                JSONArray dataArray = new JSONArray();
+                JSONObject data = new JSONObject();
+                data.put(DataColumns.CONTENT, name);
+                dataArray.put(data);
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+                return js;
+            } else {
+                // synced task
+                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+
+                for (int i = 0; i < dataArray.length(); i++) {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    if (TextUtils.equals(data.getString(DataColumns.MIME_TYPE), DataConstants.NOTE)) {
+                        data.put(DataColumns.CONTENT, getName());
+                        break;
+                    }
+                }
+
+                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+                return mMetaInfo;
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public void setMetaInfo(MetaData metaData) {
+        if (metaData != null && metaData.getNotes() != null) {
+            try {
+                mMetaInfo = new JSONObject(metaData.getNotes());
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                mMetaInfo = null;
+            }
+        }
+    }
+
+    public int getSyncAction(Cursor c) {
+        try {
+            JSONObject noteInfo = null;
+            if (mMetaInfo != null && mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            }
+
+            if (noteInfo == null) {
+                Log.w(TAG, "it seems that note meta has been deleted");
+                return SYNC_ACTION_UPDATE_REMOTE;
+            }
+
+            if (!noteInfo.has(NoteColumns.ID)) {
+                Log.w(TAG, "remote note id seems to be deleted");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            // validate the note id now
+            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
+                Log.w(TAG, "note id doesn't match");
+                return SYNC_ACTION_UPDATE_LOCAL;
+            }
+
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    return SYNC_ACTION_UPDATE_CONFLICT;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    public boolean isWorthSaving() {
+        return mMetaInfo != null || (getName() != null && getName().trim().length() > 0)
+                || (getNotes() != null && getNotes().trim().length() > 0);
+    }
+
+    public void setCompleted(boolean completed) {
+        this.mCompleted = completed;
+    }
+
+    public void setNotes(String notes) {
+        this.mNotes = notes;
+    }
+
+    public void setPriorSibling(Task priorSibling) {
+        this.mPriorSibling = priorSibling;
+    }
+
+    public void setParent(TaskList parent) {
+        this.mParent = parent;
+    }
+
+    public boolean getCompleted() {
+        return this.mCompleted;
+    }
+
+    public String getNotes() {
+        return this.mNotes;
+    }
+
+    public Task getPriorSibling() {
+        return this.mPriorSibling;
+    }
+
+    public TaskList getParent() {
+        return this.mParent;
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/data/TaskList.java

@@ -0,0 +1,343 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.data;
+
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class TaskList extends Node {
+    private static final String TAG = TaskList.class.getSimpleName();
+
+    private int mIndex;
+
+    private ArrayList<Task> mChildren;
+
+    public TaskList() {
+        super();
+        mChildren = new ArrayList<Task>();
+        mIndex = 1;
+    }
+
+    public JSONObject getCreateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_CREATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // index
+            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mIndex);
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_CREATOR_ID, "null");
+            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE,
+                    GTaskStringUtils.GTASK_JSON_TYPE_GROUP);
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-create jsonobject");
+        }
+
+        return js;
+    }
+
+    public JSONObject getUpdateAction(int actionId) {
+        JSONObject js = new JSONObject();
+
+        try {
+            // action_type
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_UPDATE);
+
+            // action_id
+            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);
+
+            // id
+            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());
+
+            // entity_delta
+            JSONObject entity = new JSONObject();
+            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
+            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());
+            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("fail to generate tasklist-update jsonobject");
+        }
+
+        return js;
+    }
+
+    public void setContentByRemoteJSON(JSONObject js) {
+        if (js != null) {
+            try {
+                // id
+                if (js.has(GTaskStringUtils.GTASK_JSON_ID)) {
+                    setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));
+                }
+
+                // last_modified
+                if (js.has(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)) {
+                    setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED));
+                }
+
+                // name
+                if (js.has(GTaskStringUtils.GTASK_JSON_NAME)) {
+                    setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));
+                }
+
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("fail to get tasklist content from jsonobject");
+            }
+        }
+    }
+
+    public void setContentByLocalJSON(JSONObject js) {
+        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+            Log.w(TAG, "setContentByLocalJSON: nothing is avaiable");
+        }
+
+        try {
+            JSONObject folder = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+
+            if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                String name = folder.getString(NoteColumns.SNIPPET);
+                setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + name);
+            } else if (folder.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                if (folder.getLong(NoteColumns.ID) == Notes.ID_ROOT_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT);
+                else if (folder.getLong(NoteColumns.ID) == Notes.ID_CALL_RECORD_FOLDER)
+                    setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                            + GTaskStringUtils.FOLDER_CALL_NOTE);
+                else
+                    Log.e(TAG, "invalid system folder");
+            } else {
+                Log.e(TAG, "error type");
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+    }
+
+    public JSONObject getLocalJSONFromContent() {
+        try {
+            JSONObject js = new JSONObject();
+            JSONObject folder = new JSONObject();
+
+            String folderName = getName();
+            if (getName().startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX))
+                folderName = folderName.substring(GTaskStringUtils.MIUI_FOLDER_PREFFIX.length(),
+                        folderName.length());
+            folder.put(NoteColumns.SNIPPET, folderName);
+            if (folderName.equals(GTaskStringUtils.FOLDER_DEFAULT)
+                    || folderName.equals(GTaskStringUtils.FOLDER_CALL_NOTE))
+                folder.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+            else
+                folder.put(NoteColumns.TYPE, Notes.TYPE_FOLDER);
+
+            js.put(GTaskStringUtils.META_HEAD_NOTE, folder);
+
+            return js;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public int getSyncAction(Cursor c) {
+        try {
+            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
+                // there is no local update
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // no update both side
+                    return SYNC_ACTION_NONE;
+                } else {
+                    // apply remote to local
+                    return SYNC_ACTION_UPDATE_LOCAL;
+                }
+            } else {
+                // validate gtask id
+                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
+                    Log.e(TAG, "gtask id doesn't match");
+                    return SYNC_ACTION_ERROR;
+                }
+                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
+                    // local modification only
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                } else {
+                    // for folder conflicts, just apply local modification
+                    return SYNC_ACTION_UPDATE_REMOTE;
+                }
+            }
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+
+        return SYNC_ACTION_ERROR;
+    }
+
+    public int getChildTaskCount() {
+        return mChildren.size();
+    }
+
+    public boolean addChildTask(Task task) {
+        boolean ret = false;
+        if (task != null && !mChildren.contains(task)) {
+            ret = mChildren.add(task);
+            if (ret) {
+                // need to set prior sibling and parent
+                task.setPriorSibling(mChildren.isEmpty() ? null : mChildren
+                        .get(mChildren.size() - 1));
+                task.setParent(this);
+            }
+        }
+        return ret;
+    }
+
+    public boolean addChildTask(Task task, int index) {
+        if (index < 0 || index > mChildren.size()) {
+            Log.e(TAG, "add child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (task != null && pos == -1) {
+            mChildren.add(index, task);
+
+            // update the task list
+            Task preTask = null;
+            Task afterTask = null;
+            if (index != 0)
+                preTask = mChildren.get(index - 1);
+            if (index != mChildren.size() - 1)
+                afterTask = mChildren.get(index + 1);
+
+            task.setPriorSibling(preTask);
+            if (afterTask != null)
+                afterTask.setPriorSibling(task);
+        }
+
+        return true;
+    }
+
+    public boolean removeChildTask(Task task) {
+        boolean ret = false;
+        int index = mChildren.indexOf(task);
+        if (index != -1) {
+            ret = mChildren.remove(task);
+
+            if (ret) {
+                // reset prior sibling and parent
+                task.setPriorSibling(null);
+                task.setParent(null);
+
+                // update the task list
+                if (index != mChildren.size()) {
+                    mChildren.get(index).setPriorSibling(
+                            index == 0 ? null : mChildren.get(index - 1));
+                }
+            }
+        }
+        return ret;
+    }
+
+    public boolean moveChildTask(Task task, int index) {
+
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "move child task: invalid index");
+            return false;
+        }
+
+        int pos = mChildren.indexOf(task);
+        if (pos == -1) {
+            Log.e(TAG, "move child task: the task should in the list");
+            return false;
+        }
+
+        if (pos == index)
+            return true;
+        return (removeChildTask(task) && addChildTask(task, index));
+    }
+
+    public Task findChildTaskByGid(String gid) {
+        for (int i = 0; i < mChildren.size(); i++) {
+            Task t = mChildren.get(i);
+            if (t.getGid().equals(gid)) {
+                return t;
+            }
+        }
+        return null;
+    }
+
+    public int getChildTaskIndex(Task task) {
+        return mChildren.indexOf(task);
+    }
+
+    public Task getChildTaskByIndex(int index) {
+        if (index < 0 || index >= mChildren.size()) {
+            Log.e(TAG, "getTaskByIndex: invalid index");
+            return null;
+        }
+        return mChildren.get(index);
+    }
+
+    public Task getChilTaskByGid(String gid) {
+        for (Task task : mChildren) {
+            if (task.getGid().equals(gid))
+                return task;
+        }
+        return null;
+    }
+
+    public ArrayList<Task> getChildTaskList() {
+        return this.mChildren;
+    }
+
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+    public int getIndex() {
+        return this.mIndex;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/exception/ActionFailureException.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.exception;
+
+public class ActionFailureException extends RuntimeException {
+    private static final long serialVersionUID = 4425249765923293627L;
+
+    public ActionFailureException() {
+        super();
+    }
+
+    public ActionFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public ActionFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/exception/NetworkFailureException.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.exception;
+
+public class NetworkFailureException extends Exception {
+    private static final long serialVersionUID = 2107610287180234136L;
+
+    public NetworkFailureException() {
+        super();
+    }
+
+    public NetworkFailureException(String paramString) {
+        super(paramString);
+    }
+
+    public NetworkFailureException(String paramString, Throwable paramThrowable) {
+        super(paramString, paramThrowable);
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/remote/GTaskASyncTask.java

@@ -0,0 +1,138 @@
+
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.remote;
+
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.os.AsyncTask;
+
+// 新增以下导入
+import android.os.Build;
+import androidx.core.content.ContextCompat;
+import android.Manifest;
+import android.content.pm.PackageManager;
+
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.ui.NotesListActivity;
+import net.micode.xiaomi_note.ui.NotesPreferenceActivity;
+
+
+public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
+
+    private static final int GTASK_SYNC_NOTIFICATION_ID = 5234235;
+
+    public interface OnCompleteListener {
+        void onComplete();
+    }
+
+    private Context mContext;
+
+    private NotificationManager mNotifiManager;
+
+    private GTaskManager mTaskManager;
+
+    private OnCompleteListener mOnCompleteListener;
+
+    public GTaskASyncTask(Context context, OnCompleteListener listener) {
+        mContext = context;
+        mOnCompleteListener = listener;
+        mNotifiManager = (NotificationManager) mContext
+                .getSystemService(Context.NOTIFICATION_SERVICE);
+        mTaskManager = GTaskManager.getInstance();
+    }
+
+    public void cancelSync() {
+        mTaskManager.cancelSync();
+    }
+
+    public void publishProgess(String message) {
+        publishProgress(new String[] {
+            message
+        });
+    }
+
+    private void showNotification(int tickerId, String content) {
+        // 添加权限检查（此处为关键修改点）
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            if (ContextCompat.checkSelfPermission(mContext, Manifest.permission.POST_NOTIFICATIONS)
+                    != PackageManager.PERMISSION_GRANTED) {
+                // 无权限时直接返回，避免崩溃
+                return;
+            }
+        }
+        PendingIntent pendingIntent;
+        if (tickerId != R.string.ticker_success) {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesPreferenceActivity.class), PendingIntent.FLAG_IMMUTABLE);
+        } else {
+            pendingIntent = PendingIntent.getActivity(mContext, 0, new Intent(mContext,
+                    NotesListActivity.class), PendingIntent.FLAG_IMMUTABLE);
+        }
+        Notification.Builder builder = new Notification.Builder(mContext)
+                .setAutoCancel(true)
+                .setContentTitle(mContext.getString(R.string.app_name))
+                .setContentText(content)
+                .setContentIntent(pendingIntent)
+                .setWhen(System.currentTimeMillis())
+                .setOngoing(true);
+        Notification notification=builder.getNotification();
+        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
+    }
+
+    @Override
+    protected Integer doInBackground(Void... unused) {
+        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
+                .getSyncAccountName(mContext)));
+        return mTaskManager.sync(mContext, this);
+    }
+
+    @Override
+    protected void onProgressUpdate(String... progress) {
+        showNotification(R.string.ticker_syncing, progress[0]);
+        if (mContext instanceof GTaskSyncService) {
+            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
+        }
+    }
+
+    @Override
+    protected void onPostExecute(Integer result) {
+        if (result == GTaskManager.STATE_SUCCESS) {
+            showNotification(R.string.ticker_success, mContext.getString(
+                    R.string.success_sync_account, mTaskManager.getSyncAccount()));
+            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis());
+        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
+        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
+            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
+        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
+            showNotification(R.string.ticker_cancel, mContext
+                    .getString(R.string.error_sync_cancelled));
+        }
+        if (mOnCompleteListener != null) {
+            new Thread(new Runnable() {
+
+                public void run() {
+                    mOnCompleteListener.onComplete();
+                }
+            }).start();
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/remote/GTaskClient.java

@@ -0,0 +1,585 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.remote;
+
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.accounts.AccountManagerFuture;
+import android.app.Activity;
+import android.os.Bundle;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.xiaomi_note.gtask.data.Node;
+import net.micode.xiaomi_note.gtask.data.Task;
+import net.micode.xiaomi_note.gtask.data.TaskList;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+import net.micode.xiaomi_note.gtask.exception.NetworkFailureException;
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+import net.micode.xiaomi_note.ui.NotesPreferenceActivity;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.ClientProtocolException;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.client.methods.HttpPost;
+import org.apache.http.cookie.Cookie;
+import org.apache.http.impl.client.BasicCookieStore;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.params.BasicHttpParams;
+import org.apache.http.params.HttpConnectionParams;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.HttpProtocolParams;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+
+public class GTaskClient {
+    private static final String TAG = GTaskClient.class.getSimpleName();
+
+    private static final String GTASK_URL = "https://mail.google.com/tasks/";
+
+    private static final String GTASK_GET_URL = "https://mail.google.com/tasks/ig";
+
+    private static final String GTASK_POST_URL = "https://mail.google.com/tasks/r/ig";
+
+    private static GTaskClient mInstance = null;
+
+    private DefaultHttpClient mHttpClient;
+
+    private String mGetUrl;
+
+    private String mPostUrl;
+
+    private long mClientVersion;
+
+    private boolean mLoggedin;
+
+    private long mLastLoginTime;
+
+    private int mActionId;
+
+    private Account mAccount;
+
+    private JSONArray mUpdateArray;
+
+    private GTaskClient() {
+        mHttpClient = null;
+        mGetUrl = GTASK_GET_URL;
+        mPostUrl = GTASK_POST_URL;
+        mClientVersion = -1;
+        mLoggedin = false;
+        mLastLoginTime = 0;
+        mActionId = 1;
+        mAccount = null;
+        mUpdateArray = null;
+    }
+
+    public static synchronized GTaskClient getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskClient();
+        }
+        return mInstance;
+    }
+
+    public boolean login(Activity activity) {
+        // we suppose that the cookie would expire after 5 minutes
+        // then we need to re-login
+        final long interval = 1000 * 60 * 5;
+        if (mLastLoginTime + interval < System.currentTimeMillis()) {
+            mLoggedin = false;
+        }
+
+        // need to re-login after account switch
+        if (mLoggedin
+                && !TextUtils.equals(getSyncAccount().name, NotesPreferenceActivity
+                        .getSyncAccountName(activity))) {
+            mLoggedin = false;
+        }
+
+        if (mLoggedin) {
+            Log.d(TAG, "already logged in");
+            return true;
+        }
+
+        mLastLoginTime = System.currentTimeMillis();
+        String authToken = loginGoogleAccount(activity, false);
+        if (authToken == null) {
+            Log.e(TAG, "login google account failed");
+            return false;
+        }
+
+        // login with custom domain if necessary
+        if (!(mAccount.name.toLowerCase().endsWith("gmail.com") || mAccount.name.toLowerCase()
+                .endsWith("googlemail.com"))) {
+            StringBuilder url = new StringBuilder(GTASK_URL).append("a/");
+            int index = mAccount.name.indexOf('@') + 1;
+            String suffix = mAccount.name.substring(index);
+            url.append(suffix + "/");
+            mGetUrl = url.toString() + "ig";
+            mPostUrl = url.toString() + "r/ig";
+
+            if (tryToLoginGtask(activity, authToken)) {
+                mLoggedin = true;
+            }
+        }
+
+        // try to login with google official url
+        if (!mLoggedin) {
+            mGetUrl = GTASK_GET_URL;
+            mPostUrl = GTASK_POST_URL;
+            if (!tryToLoginGtask(activity, authToken)) {
+                return false;
+            }
+        }
+
+        mLoggedin = true;
+        return true;
+    }
+
+    private String loginGoogleAccount(Activity activity, boolean invalidateToken) {
+        String authToken;
+        AccountManager accountManager = AccountManager.get(activity);
+        Account[] accounts = accountManager.getAccountsByType("com.google");
+
+        if (accounts.length == 0) {
+            Log.e(TAG, "there is no available google account");
+            return null;
+        }
+
+        String accountName = NotesPreferenceActivity.getSyncAccountName(activity);
+        Account account = null;
+        for (Account a : accounts) {
+            if (a.name.equals(accountName)) {
+                account = a;
+                break;
+            }
+        }
+        if (account != null) {
+            mAccount = account;
+        } else {
+            Log.e(TAG, "unable to get an account with the same name in the settings");
+            return null;
+        }
+
+        // get the token now
+        AccountManagerFuture<Bundle> accountManagerFuture = accountManager.getAuthToken(account,
+                "goanna_mobile", null, activity, null, null);
+        try {
+            Bundle authTokenBundle = accountManagerFuture.getResult();
+            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN);
+            if (invalidateToken) {
+                accountManager.invalidateAuthToken("com.google", authToken);
+                loginGoogleAccount(activity, false);
+            }
+        } catch (Exception e) {
+            Log.e(TAG, "get auth token failed");
+            authToken = null;
+        }
+
+        return authToken;
+    }
+
+    private boolean tryToLoginGtask(Activity activity, String authToken) {
+        if (!loginGtask(authToken)) {
+            // maybe the auth token is out of date, now let's invalidate the
+            // token and try again
+            authToken = loginGoogleAccount(activity, true);
+            if (authToken == null) {
+                Log.e(TAG, "login google account failed");
+                return false;
+            }
+
+            if (!loginGtask(authToken)) {
+                Log.e(TAG, "login gtask failed");
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private boolean loginGtask(String authToken) {
+        int timeoutConnection = 10000;
+        int timeoutSocket = 15000;
+        HttpParams httpParameters = new BasicHttpParams();
+        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
+        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
+        mHttpClient = new DefaultHttpClient(httpParameters);
+        BasicCookieStore localBasicCookieStore = new BasicCookieStore();
+        mHttpClient.setCookieStore(localBasicCookieStore);
+        HttpProtocolParams.setUseExpectContinue(mHttpClient.getParams(), false);
+
+        // login gtask
+        try {
+            String loginUrl = mGetUrl + "?auth=" + authToken;
+            HttpGet httpGet = new HttpGet(loginUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the cookie now
+            List<Cookie> cookies = mHttpClient.getCookieStore().getCookies();
+            boolean hasAuthCookie = false;
+            for (Cookie cookie : cookies) {
+                if (cookie.getName().contains("GTL")) {
+                    hasAuthCookie = true;
+                }
+            }
+            if (!hasAuthCookie) {
+                Log.w(TAG, "it seems that there is no auth cookie");
+            }
+
+            // get the client version
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            mClientVersion = js.getLong("v");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        } catch (Exception e) {
+            // simply catch all exceptions
+            Log.e(TAG, "httpget gtask_url failed");
+            return false;
+        }
+
+        return true;
+    }
+
+    private int getActionId() {
+        return mActionId++;
+    }
+
+    private HttpPost createHttpPost() {
+        HttpPost httpPost = new HttpPost(mPostUrl);
+        httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
+        httpPost.setHeader("AT", "1");
+        return httpPost;
+    }
+
+    private String getResponseContent(HttpEntity entity) throws IOException {
+        String contentEncoding = null;
+        if (entity.getContentEncoding() != null) {
+            contentEncoding = entity.getContentEncoding().getValue();
+            Log.d(TAG, "encoding: " + contentEncoding);
+        }
+
+        InputStream input = entity.getContent();
+        if (contentEncoding != null && contentEncoding.equalsIgnoreCase("gzip")) {
+            input = new GZIPInputStream(entity.getContent());
+        } else if (contentEncoding != null && contentEncoding.equalsIgnoreCase("deflate")) {
+            Inflater inflater = new Inflater(true);
+            input = new InflaterInputStream(entity.getContent(), inflater);
+        }
+
+        try {
+            InputStreamReader isr = new InputStreamReader(input);
+            BufferedReader br = new BufferedReader(isr);
+            StringBuilder sb = new StringBuilder();
+
+            while (true) {
+                String buff = br.readLine();
+                if (buff == null) {
+                    return sb.toString();
+                }
+                sb = sb.append(buff);
+            }
+        } finally {
+            input.close();
+        }
+    }
+
+    private JSONObject postRequest(JSONObject js) throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        HttpPost httpPost = createHttpPost();
+        try {
+            LinkedList<BasicNameValuePair> list = new LinkedList<BasicNameValuePair>();
+            list.add(new BasicNameValuePair("r", js.toString()));
+            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, "UTF-8");
+            httpPost.setEntity(entity);
+
+            // execute the post
+            HttpResponse response = mHttpClient.execute(httpPost);
+            String jsString = getResponseContent(response.getEntity());
+            return new JSONObject(jsString);
+
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("postRequest failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("unable to convert response content to jsonobject");
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("error occurs when posting request");
+        }
+    }
+
+    public void createTask(Task task) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(task.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            task.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create task: handing jsonobject failed");
+        }
+    }
+
+    public void createTaskList(TaskList tasklist) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            actionList.put(tasklist.getCreateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            // post
+            JSONObject jsResponse = postRequest(jsPost);
+            JSONObject jsResult = (JSONObject) jsResponse.getJSONArray(
+                    GTaskStringUtils.GTASK_JSON_RESULTS).get(0);
+            tasklist.setGid(jsResult.getString(GTaskStringUtils.GTASK_JSON_NEW_ID));
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("create tasklist: handing jsonobject failed");
+        }
+    }
+
+    public void commitUpdate() throws NetworkFailureException {
+        if (mUpdateArray != null) {
+            try {
+                JSONObject jsPost = new JSONObject();
+
+                // action_list
+                jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, mUpdateArray);
+
+                // client_version
+                jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+                postRequest(jsPost);
+                mUpdateArray = null;
+            } catch (JSONException e) {
+                Log.e(TAG, e.toString());
+                e.printStackTrace();
+                throw new ActionFailureException("commit update: handing jsonobject failed");
+            }
+        }
+    }
+
+    public void addUpdateNode(Node node) throws NetworkFailureException {
+        if (node != null) {
+            // too many update items may result in an error
+            // set max to 10 items
+            if (mUpdateArray != null && mUpdateArray.length() > 10) {
+                commitUpdate();
+            }
+
+            if (mUpdateArray == null)
+                mUpdateArray = new JSONArray();
+            mUpdateArray.put(node.getUpdateAction(getActionId()));
+        }
+    }
+
+    public void moveTask(Task task, TaskList preParent, TaskList curParent)
+            throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_MOVE);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_ID, task.getGid());
+            if (preParent == curParent && task.getPriorSibling() != null) {
+                // put prioring_sibing_id only if moving within the tasklist and
+                // it is not the first one
+                action.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, task.getPriorSibling());
+            }
+            action.put(GTaskStringUtils.GTASK_JSON_SOURCE_LIST, preParent.getGid());
+            action.put(GTaskStringUtils.GTASK_JSON_DEST_PARENT, curParent.getGid());
+            if (preParent != curParent) {
+                // put the dest_list only if moving between tasklists
+                action.put(GTaskStringUtils.GTASK_JSON_DEST_LIST, curParent.getGid());
+            }
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("move task: handing jsonobject failed");
+        }
+    }
+
+    public void deleteNode(Node node) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+
+            // action_list
+            node.setDeleted(true);
+            actionList.put(node.getUpdateAction(getActionId()));
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            postRequest(jsPost);
+            mUpdateArray = null;
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("delete node: handing jsonobject failed");
+        }
+    }
+
+    public JSONArray getTaskLists() throws NetworkFailureException {
+        if (!mLoggedin) {
+            Log.e(TAG, "please login first");
+            throw new ActionFailureException("not logged in");
+        }
+
+        try {
+            HttpGet httpGet = new HttpGet(mGetUrl);
+            HttpResponse response = null;
+            response = mHttpClient.execute(httpGet);
+
+            // get the task list
+            String resString = getResponseContent(response.getEntity());
+            String jsBegin = "_setup(";
+            String jsEnd = ")}</script>";
+            int begin = resString.indexOf(jsBegin);
+            int end = resString.lastIndexOf(jsEnd);
+            String jsString = null;
+            if (begin != -1 && end != -1 && begin < end) {
+                jsString = resString.substring(begin + jsBegin.length(), end);
+            }
+            JSONObject js = new JSONObject(jsString);
+            return js.getJSONObject("t").getJSONArray(GTaskStringUtils.GTASK_JSON_LISTS);
+        } catch (ClientProtocolException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (IOException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new NetworkFailureException("gettasklists: httpget failed");
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task lists: handing jasonobject failed");
+        }
+    }
+
+    public JSONArray getTaskList(String listGid) throws NetworkFailureException {
+        commitUpdate();
+        try {
+            JSONObject jsPost = new JSONObject();
+            JSONArray actionList = new JSONArray();
+            JSONObject action = new JSONObject();
+
+            // action_list
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE,
+                    GTaskStringUtils.GTASK_JSON_ACTION_TYPE_GETALL);
+            action.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, getActionId());
+            action.put(GTaskStringUtils.GTASK_JSON_LIST_ID, listGid);
+            action.put(GTaskStringUtils.GTASK_JSON_GET_DELETED, false);
+            actionList.put(action);
+            jsPost.put(GTaskStringUtils.GTASK_JSON_ACTION_LIST, actionList);
+
+            // client_version
+            jsPost.put(GTaskStringUtils.GTASK_JSON_CLIENT_VERSION, mClientVersion);
+
+            JSONObject jsResponse = postRequest(jsPost);
+            return jsResponse.getJSONArray(GTaskStringUtils.GTASK_JSON_TASKS);
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("get task list: handing jsonobject failed");
+        }
+    }
+
+    public Account getSyncAccount() {
+        return mAccount;
+    }
+
+    public void resetUpdateArray() {
+        mUpdateArray = null;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/remote/GTaskManager.java

@@ -0,0 +1,800 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.remote;
+
+import android.app.Activity;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.gtask.data.MetaData;
+import net.micode.xiaomi_note.gtask.data.Node;
+import net.micode.xiaomi_note.gtask.data.SqlNote;
+import net.micode.xiaomi_note.gtask.data.Task;
+import net.micode.xiaomi_note.gtask.data.TaskList;
+import net.micode.xiaomi_note.gtask.exception.ActionFailureException;
+import net.micode.xiaomi_note.gtask.exception.NetworkFailureException;
+import net.micode.xiaomi_note.tool.DataUtils;
+import net.micode.xiaomi_note.tool.GTaskStringUtils;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+
+
+public class GTaskManager {
+    private static final String TAG = GTaskManager.class.getSimpleName();
+
+    public static final int STATE_SUCCESS = 0;
+
+    public static final int STATE_NETWORK_ERROR = 1;
+
+    public static final int STATE_INTERNAL_ERROR = 2;
+
+    public static final int STATE_SYNC_IN_PROGRESS = 3;
+
+    public static final int STATE_SYNC_CANCELLED = 4;
+
+    private static GTaskManager mInstance = null;
+
+    private Activity mActivity;
+
+    private Context mContext;
+
+    private ContentResolver mContentResolver;
+
+    private boolean mSyncing;
+
+    private boolean mCancelled;
+
+    private HashMap<String, TaskList> mGTaskListHashMap;
+
+    private HashMap<String, Node> mGTaskHashMap;
+
+    private HashMap<String, MetaData> mMetaHashMap;
+
+    private TaskList mMetaList;
+
+    private HashSet<Long> mLocalDeleteIdMap;
+
+    private HashMap<String, Long> mGidToNid;
+
+    private HashMap<Long, String> mNidToGid;
+
+    private GTaskManager() {
+        mSyncing = false;
+        mCancelled = false;
+        mGTaskListHashMap = new HashMap<String, TaskList>();
+        mGTaskHashMap = new HashMap<String, Node>();
+        mMetaHashMap = new HashMap<String, MetaData>();
+        mMetaList = null;
+        mLocalDeleteIdMap = new HashSet<Long>();
+        mGidToNid = new HashMap<String, Long>();
+        mNidToGid = new HashMap<Long, String>();
+    }
+
+    public static synchronized GTaskManager getInstance() {
+        if (mInstance == null) {
+            mInstance = new GTaskManager();
+        }
+        return mInstance;
+    }
+
+    public synchronized void setActivityContext(Activity activity) {
+        // used for getting authtoken
+        mActivity = activity;
+    }
+
+    public int sync(Context context, GTaskASyncTask asyncTask) {
+        if (mSyncing) {
+            Log.d(TAG, "Sync is in progress");
+            return STATE_SYNC_IN_PROGRESS;
+        }
+        mContext = context;
+        mContentResolver = mContext.getContentResolver();
+        mSyncing = true;
+        mCancelled = false;
+        mGTaskListHashMap.clear();
+        mGTaskHashMap.clear();
+        mMetaHashMap.clear();
+        mLocalDeleteIdMap.clear();
+        mGidToNid.clear();
+        mNidToGid.clear();
+
+        try {
+            GTaskClient client = GTaskClient.getInstance();
+            client.resetUpdateArray();
+
+            // login google task
+            if (!mCancelled) {
+                if (!client.login(mActivity)) {
+                    throw new NetworkFailureException("login google task failed");
+                }
+            }
+
+            // get the task list from google
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
+            initGTaskList();
+
+            // do content sync work
+            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
+            syncContent();
+        } catch (NetworkFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_NETWORK_ERROR;
+        } catch (ActionFailureException e) {
+            Log.e(TAG, e.toString());
+            return STATE_INTERNAL_ERROR;
+        } catch (Exception e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return STATE_INTERNAL_ERROR;
+        } finally {
+            mGTaskListHashMap.clear();
+            mGTaskHashMap.clear();
+            mMetaHashMap.clear();
+            mLocalDeleteIdMap.clear();
+            mGidToNid.clear();
+            mNidToGid.clear();
+            mSyncing = false;
+        }
+
+        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
+    }
+
+    private void initGTaskList() throws NetworkFailureException {
+        if (mCancelled)
+            return;
+        GTaskClient client = GTaskClient.getInstance();
+        try {
+            JSONArray jsTaskLists = client.getTaskLists();
+
+            // init meta list first
+            mMetaList = null;
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name
+                        .equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
+                    mMetaList = new TaskList();
+                    mMetaList.setContentByRemoteJSON(object);
+
+                    // load meta data
+                    JSONArray jsMetas = client.getTaskList(gid);
+                    for (int j = 0; j < jsMetas.length(); j++) {
+                        object = (JSONObject) jsMetas.getJSONObject(j);
+                        MetaData metaData = new MetaData();
+                        metaData.setContentByRemoteJSON(object);
+                        if (metaData.isWorthSaving()) {
+                            mMetaList.addChildTask(metaData);
+                            if (metaData.getGid() != null) {
+                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
+                            }
+                        }
+                    }
+                }
+            }
+
+            // create meta list if not existed
+            if (mMetaList == null) {
+                mMetaList = new TaskList();
+                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                        + GTaskStringUtils.FOLDER_META);
+                GTaskClient.getInstance().createTaskList(mMetaList);
+            }
+
+            // init task list
+            for (int i = 0; i < jsTaskLists.length(); i++) {
+                JSONObject object = jsTaskLists.getJSONObject(i);
+                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
+
+                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)
+                        && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                + GTaskStringUtils.FOLDER_META)) {
+                    TaskList tasklist = new TaskList();
+                    tasklist.setContentByRemoteJSON(object);
+                    mGTaskListHashMap.put(gid, tasklist);
+                    mGTaskHashMap.put(gid, tasklist);
+
+                    // load tasks
+                    JSONArray jsTasks = client.getTaskList(gid);
+                    for (int j = 0; j < jsTasks.length(); j++) {
+                        object = (JSONObject) jsTasks.getJSONObject(j);
+                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
+                        Task task = new Task();
+                        task.setContentByRemoteJSON(object);
+                        if (task.isWorthSaving()) {
+                            task.setMetaInfo(mMetaHashMap.get(gid));
+                            tasklist.addChildTask(task);
+                            mGTaskHashMap.put(gid, task);
+                        }
+                    }
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
+        }
+    }
+
+    private void syncContent() throws NetworkFailureException {
+        int syncType;
+        Cursor c = null;
+        String gid;
+        Node node;
+
+        mLocalDeleteIdMap.clear();
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for local deleted note
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id=?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, null);
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        doContentSync(Node.SYNC_ACTION_DEL_REMOTE, node, c);
+                    }
+
+                    mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                }
+            } else {
+                Log.w(TAG, "failed to query trash folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // sync folder first
+        syncFolder();
+
+        // for note existing in database
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_NOTE), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing note in database");
+            }
+
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // go through remaining items
+        Iterator<Map.Entry<String, Node>> iter = mGTaskHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, Node> entry = iter.next();
+            node = entry.getValue();
+            doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+        }
+
+        // mCancelled can be set by another thread, so we neet to check one by
+        // one
+        // clear local delete table
+        if (!mCancelled) {
+            if (!DataUtils.batchDeleteNotes(mContentResolver, mLocalDeleteIdMap)) {
+                throw new ActionFailureException("failed to batch-delete local deleted notes");
+            }
+        }
+
+        // refresh local sync id
+        if (!mCancelled) {
+            GTaskClient.getInstance().commitUpdate();
+            refreshLocalSyncId();
+        }
+
+    }
+
+    private void syncFolder() throws NetworkFailureException {
+        Cursor c = null;
+        String gid;
+        Node node;
+        int syncType;
+
+        if (mCancelled) {
+            return;
+        }
+
+        // for root folder
+        try {
+            c = mContentResolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                    Notes.ID_ROOT_FOLDER), SqlNote.PROJECTION_NOTE, null, null, null);
+            if (c != null) {
+                c.moveToNext();
+                gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                node = mGTaskHashMap.get(gid);
+                if (node != null) {
+                    mGTaskHashMap.remove(gid);
+                    mGidToNid.put(gid, (long) Notes.ID_ROOT_FOLDER);
+                    mNidToGid.put((long) Notes.ID_ROOT_FOLDER, gid);
+                    // for system folder, only update remote name if necessary
+                    if (!node.getName().equals(
+                            GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT))
+                        doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                } else {
+                    doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query root folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for call-note folder
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE, "(_id=?)",
+                    new String[] {
+                        String.valueOf(Notes.ID_CALL_RECORD_FOLDER)
+                    }, null);
+            if (c != null) {
+                if (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, (long) Notes.ID_CALL_RECORD_FOLDER);
+                        mNidToGid.put((long) Notes.ID_CALL_RECORD_FOLDER, gid);
+                        // for system folder, only update remote name if
+                        // necessary
+                        if (!node.getName().equals(
+                                GTaskStringUtils.MIUI_FOLDER_PREFFIX
+                                        + GTaskStringUtils.FOLDER_CALL_NOTE))
+                            doContentSync(Node.SYNC_ACTION_UPDATE_REMOTE, node, c);
+                    } else {
+                        doContentSync(Node.SYNC_ACTION_ADD_REMOTE, node, c);
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query call note folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for local existing folders
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type=? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        mGidToNid.put(gid, c.getLong(SqlNote.ID_COLUMN));
+                        mNidToGid.put(c.getLong(SqlNote.ID_COLUMN), gid);
+                        syncType = node.getSyncAction(c);
+                    } else {
+                        if (c.getString(SqlNote.GTASK_ID_COLUMN).trim().length() == 0) {
+                            // local add
+                            syncType = Node.SYNC_ACTION_ADD_REMOTE;
+                        } else {
+                            // remote delete
+                            syncType = Node.SYNC_ACTION_DEL_LOCAL;
+                        }
+                    }
+                    doContentSync(syncType, node, c);
+                }
+            } else {
+                Log.w(TAG, "failed to query existing folder");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+
+        // for remote add folders
+        Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+        while (iter.hasNext()) {
+            Map.Entry<String, TaskList> entry = iter.next();
+            gid = entry.getKey();
+            node = entry.getValue();
+            if (mGTaskHashMap.containsKey(gid)) {
+                mGTaskHashMap.remove(gid);
+                doContentSync(Node.SYNC_ACTION_ADD_LOCAL, node, null);
+            }
+        }
+
+        if (!mCancelled)
+            GTaskClient.getInstance().commitUpdate();
+    }
+
+    private void doContentSync(int syncType, Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        MetaData meta;
+        switch (syncType) {
+            case Node.SYNC_ACTION_ADD_LOCAL:
+                addLocalNode(node);
+                break;
+            case Node.SYNC_ACTION_ADD_REMOTE:
+                addRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_DEL_LOCAL:
+                meta = mMetaHashMap.get(c.getString(SqlNote.GTASK_ID_COLUMN));
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                mLocalDeleteIdMap.add(c.getLong(SqlNote.ID_COLUMN));
+                break;
+            case Node.SYNC_ACTION_DEL_REMOTE:
+                meta = mMetaHashMap.get(node.getGid());
+                if (meta != null) {
+                    GTaskClient.getInstance().deleteNode(meta);
+                }
+                GTaskClient.getInstance().deleteNode(node);
+                break;
+            case Node.SYNC_ACTION_UPDATE_LOCAL:
+                updateLocalNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_REMOTE:
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_UPDATE_CONFLICT:
+                // merging both modifications maybe a good idea
+                // right now just use local update simply
+                updateRemoteNode(node, c);
+                break;
+            case Node.SYNC_ACTION_NONE:
+                break;
+            case Node.SYNC_ACTION_ERROR:
+            default:
+                throw new ActionFailureException("unkown sync action type");
+        }
+    }
+
+    private void addLocalNode(Node node) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        if (node instanceof TaskList) {
+            if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_DEFAULT)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_ROOT_FOLDER);
+            } else if (node.getName().equals(
+                    GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_CALL_NOTE)) {
+                sqlNote = new SqlNote(mContext, Notes.ID_CALL_RECORD_FOLDER);
+            } else {
+                sqlNote = new SqlNote(mContext);
+                sqlNote.setContent(node.getLocalJSONFromContent());
+                sqlNote.setParentId(Notes.ID_ROOT_FOLDER);
+            }
+        } else {
+            sqlNote = new SqlNote(mContext);
+            JSONObject js = node.getLocalJSONFromContent();
+            try {
+                if (js.has(GTaskStringUtils.META_HEAD_NOTE)) {
+                    JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+                    if (note.has(NoteColumns.ID)) {
+                        long id = note.getLong(NoteColumns.ID);
+                        if (DataUtils.existInNoteDatabase(mContentResolver, id)) {
+                            // the id is not available, have to create a new one
+                            note.remove(NoteColumns.ID);
+                        }
+                    }
+                }
+
+                if (js.has(GTaskStringUtils.META_HEAD_DATA)) {
+                    JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                    for (int i = 0; i < dataArray.length(); i++) {
+                        JSONObject data = dataArray.getJSONObject(i);
+                        if (data.has(DataColumns.ID)) {
+                            long dataId = data.getLong(DataColumns.ID);
+                            if (DataUtils.existInDataDatabase(mContentResolver, dataId)) {
+                                // the data id is not available, have to create
+                                // a new one
+                                data.remove(DataColumns.ID);
+                            }
+                        }
+                    }
+
+                }
+            } catch (JSONException e) {
+                Log.w(TAG, e.toString());
+                e.printStackTrace();
+            }
+            sqlNote.setContent(js);
+
+            Long parentId = mGidToNid.get(((Task) node).getParent().getGid());
+            if (parentId == null) {
+                Log.e(TAG, "cannot find task's parent id locally");
+                throw new ActionFailureException("cannot add local node");
+            }
+            sqlNote.setParentId(parentId.longValue());
+        }
+
+        // create the local node
+        sqlNote.setGtaskId(node.getGid());
+        sqlNote.commit(false);
+
+        // update gid-nid mapping
+        mGidToNid.put(node.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), node.getGid());
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    private void updateLocalNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote;
+        // update the note locally
+        sqlNote = new SqlNote(mContext, c);
+        sqlNote.setContent(node.getLocalJSONFromContent());
+
+        Long parentId = (node instanceof Task) ? mGidToNid.get(((Task) node).getParent().getGid())
+                : new Long(Notes.ID_ROOT_FOLDER);
+        if (parentId == null) {
+            Log.e(TAG, "cannot find task's parent id locally");
+            throw new ActionFailureException("cannot update local node");
+        }
+        sqlNote.setParentId(parentId.longValue());
+        sqlNote.commit(true);
+
+        // update meta info
+        updateRemoteMeta(node.getGid(), sqlNote);
+    }
+
+    private void addRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+        Node n;
+
+        // update remotely
+        if (sqlNote.isNoteType()) {
+            Task task = new Task();
+            task.setContentByLocalJSON(sqlNote.getContent());
+
+            String parentGid = mNidToGid.get(sqlNote.getParentId());
+            if (parentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot add remote task");
+            }
+            mGTaskListHashMap.get(parentGid).addChildTask(task);
+
+            GTaskClient.getInstance().createTask(task);
+            n = (Node) task;
+
+            // add meta
+            updateRemoteMeta(task.getGid(), sqlNote);
+        } else {
+            TaskList tasklist = null;
+
+            // we need to skip folder if it has already existed
+            String folderName = GTaskStringUtils.MIUI_FOLDER_PREFFIX;
+            if (sqlNote.getId() == Notes.ID_ROOT_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_DEFAULT;
+            else if (sqlNote.getId() == Notes.ID_CALL_RECORD_FOLDER)
+                folderName += GTaskStringUtils.FOLDER_CALL_NOTE;
+            else
+                folderName += sqlNote.getSnippet();
+
+            Iterator<Map.Entry<String, TaskList>> iter = mGTaskListHashMap.entrySet().iterator();
+            while (iter.hasNext()) {
+                Map.Entry<String, TaskList> entry = iter.next();
+                String gid = entry.getKey();
+                TaskList list = entry.getValue();
+
+                if (list.getName().equals(folderName)) {
+                    tasklist = list;
+                    if (mGTaskHashMap.containsKey(gid)) {
+                        mGTaskHashMap.remove(gid);
+                    }
+                    break;
+                }
+            }
+
+            // no match we can add now
+            if (tasklist == null) {
+                tasklist = new TaskList();
+                tasklist.setContentByLocalJSON(sqlNote.getContent());
+                GTaskClient.getInstance().createTaskList(tasklist);
+                mGTaskListHashMap.put(tasklist.getGid(), tasklist);
+            }
+            n = (Node) tasklist;
+        }
+
+        // update local note
+        sqlNote.setGtaskId(n.getGid());
+        sqlNote.commit(false);
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+
+        // gid-id mapping
+        mGidToNid.put(n.getGid(), sqlNote.getId());
+        mNidToGid.put(sqlNote.getId(), n.getGid());
+    }
+
+    private void updateRemoteNode(Node node, Cursor c) throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        SqlNote sqlNote = new SqlNote(mContext, c);
+
+        // update remotely
+        node.setContentByLocalJSON(sqlNote.getContent());
+        GTaskClient.getInstance().addUpdateNode(node);
+
+        // update meta
+        updateRemoteMeta(node.getGid(), sqlNote);
+
+        // move task if necessary
+        if (sqlNote.isNoteType()) {
+            Task task = (Task) node;
+            TaskList preParentList = task.getParent();
+
+            String curParentGid = mNidToGid.get(sqlNote.getParentId());
+            if (curParentGid == null) {
+                Log.e(TAG, "cannot find task's parent tasklist");
+                throw new ActionFailureException("cannot update remote task");
+            }
+            TaskList curParentList = mGTaskListHashMap.get(curParentGid);
+
+            if (preParentList != curParentList) {
+                preParentList.removeChildTask(task);
+                curParentList.addChildTask(task);
+                GTaskClient.getInstance().moveTask(task, preParentList, curParentList);
+            }
+        }
+
+        // clear local modified flag
+        sqlNote.resetLocalModified();
+        sqlNote.commit(true);
+    }
+
+    private void updateRemoteMeta(String gid, SqlNote sqlNote) throws NetworkFailureException {
+        if (sqlNote != null && sqlNote.isNoteType()) {
+            MetaData metaData = mMetaHashMap.get(gid);
+            if (metaData != null) {
+                metaData.setMeta(gid, sqlNote.getContent());
+                GTaskClient.getInstance().addUpdateNode(metaData);
+            } else {
+                metaData = new MetaData();
+                metaData.setMeta(gid, sqlNote.getContent());
+                mMetaList.addChildTask(metaData);
+                mMetaHashMap.put(gid, metaData);
+                GTaskClient.getInstance().createTask(metaData);
+            }
+        }
+    }
+
+    private void refreshLocalSyncId() throws NetworkFailureException {
+        if (mCancelled) {
+            return;
+        }
+
+        // get the latest gtask list
+        mGTaskHashMap.clear();
+        mGTaskListHashMap.clear();
+        mMetaHashMap.clear();
+        initGTaskList();
+
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, SqlNote.PROJECTION_NOTE,
+                    "(type<>? AND parent_id<>?)", new String[] {
+                            String.valueOf(Notes.TYPE_SYSTEM), String.valueOf(Notes.ID_TRASH_FOLER)
+                    }, NoteColumns.TYPE + " DESC");
+            if (c != null) {
+                while (c.moveToNext()) {
+                    String gid = c.getString(SqlNote.GTASK_ID_COLUMN);
+                    Node node = mGTaskHashMap.get(gid);
+                    if (node != null) {
+                        mGTaskHashMap.remove(gid);
+                        ContentValues values = new ContentValues();
+                        values.put(NoteColumns.SYNC_ID, node.getLastModified());
+                        mContentResolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI,
+                                c.getLong(SqlNote.ID_COLUMN)), values, null, null);
+                    } else {
+                        Log.e(TAG, "something is missed");
+                        throw new ActionFailureException(
+                                "some local items don't have gid after sync");
+                    }
+                }
+            } else {
+                Log.w(TAG, "failed to query local note to refresh sync id");
+            }
+        } finally {
+            if (c != null) {
+                c.close();
+                c = null;
+            }
+        }
+    }
+
+    public String getSyncAccount() {
+        return GTaskClient.getInstance().getSyncAccount().name;
+    }
+
+    public void cancelSync() {
+        mCancelled = true;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/gtask/remote/GTaskSyncService.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.gtask.remote;
+
+import android.app.Activity;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.IBinder;
+
+public class GTaskSyncService extends Service {
+    public final static String ACTION_STRING_NAME = "sync_action_type";
+
+    public final static int ACTION_START_SYNC = 0;
+
+    public final static int ACTION_CANCEL_SYNC = 1;
+
+    public final static int ACTION_INVALID = 2;
+
+    public final static String GTASK_SERVICE_BROADCAST_NAME = "net.micode.notes.gtask.remote.gtask_sync_service";
+
+    public final static String GTASK_SERVICE_BROADCAST_IS_SYNCING = "isSyncing";
+
+    public final static String GTASK_SERVICE_BROADCAST_PROGRESS_MSG = "progressMsg";
+
+    private static GTaskASyncTask mSyncTask = null;
+
+    private static String mSyncProgress = "";
+
+    private void startSync() {
+        if (mSyncTask == null) {
+            mSyncTask = new GTaskASyncTask(this, new GTaskASyncTask.OnCompleteListener() {
+                public void onComplete() {
+                    mSyncTask = null;
+                    sendBroadcast("");
+                    stopSelf();
+                }
+            });
+            sendBroadcast("");
+            mSyncTask.execute();
+        }
+    }
+
+    private void cancelSync() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    @Override
+    public void onCreate() {
+        mSyncTask = null;
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Bundle bundle = intent.getExtras();
+        if (bundle != null && bundle.containsKey(ACTION_STRING_NAME)) {
+            switch (bundle.getInt(ACTION_STRING_NAME, ACTION_INVALID)) {
+                case ACTION_START_SYNC:
+                    startSync();
+                    break;
+                case ACTION_CANCEL_SYNC:
+                    cancelSync();
+                    break;
+                default:
+                    break;
+            }
+            return START_STICKY;
+        }
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Override
+    public void onLowMemory() {
+        if (mSyncTask != null) {
+            mSyncTask.cancelSync();
+        }
+    }
+
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    public void sendBroadcast(String msg) {
+        mSyncProgress = msg;
+        Intent intent = new Intent(GTASK_SERVICE_BROADCAST_NAME);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_IS_SYNCING, mSyncTask != null);
+        intent.putExtra(GTASK_SERVICE_BROADCAST_PROGRESS_MSG, msg);
+        sendBroadcast(intent);
+    }
+
+    public static void startSync(Activity activity) {
+        GTaskManager.getInstance().setActivityContext(activity);
+        Intent intent = new Intent(activity, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_START_SYNC);
+        activity.startService(intent);
+    }
+
+    public static void cancelSync(Context context) {
+        Intent intent = new Intent(context, GTaskSyncService.class);
+        intent.putExtra(GTaskSyncService.ACTION_STRING_NAME, GTaskSyncService.ACTION_CANCEL_SYNC);
+        context.startService(intent);
+    }
+
+    public static boolean isSyncing() {
+        return mSyncTask != null;
+    }
+
+    public static String getProgressString() {
+        return mSyncProgress;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/model/Note.java

@@ -0,0 +1,253 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.model;
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.OperationApplicationException;
+import android.net.Uri;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.CallNote;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.data.Notes.TextNote;
+
+import java.util.ArrayList;
+
+
+public class Note {
+    private ContentValues mNoteDiffValues;
+    private NoteData mNoteData;
+    private static final String TAG = "Note";
+    /**
+     * Create a new note id for adding a new note to databases
+     */
+    public static synchronized long getNewNoteId(Context context, long folderId) {
+        // Create a new note in the database
+        ContentValues values = new ContentValues();
+        long createdTime = System.currentTimeMillis();
+        values.put(NoteColumns.CREATED_DATE, createdTime);
+        values.put(NoteColumns.MODIFIED_DATE, createdTime);
+        values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        values.put(NoteColumns.PARENT_ID, folderId);
+        Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
+
+        long noteId = 0;
+        try {
+            noteId = Long.valueOf(uri.getPathSegments().get(1));
+        } catch (NumberFormatException e) {
+            Log.e(TAG, "Get note id error :" + e.toString());
+            noteId = 0;
+        }
+        if (noteId == -1) {
+            throw new IllegalStateException("Wrong note id:" + noteId);
+        }
+        return noteId;
+    }
+
+    public Note() {
+        mNoteDiffValues = new ContentValues();
+        mNoteData = new NoteData();
+    }
+
+    public void setNoteValue(String key, String value) {
+        mNoteDiffValues.put(key, value);
+        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+    }
+
+    public void setTextData(String key, String value) {
+        mNoteData.setTextData(key, value);
+    }
+
+    public void setTextDataId(long id) {
+        mNoteData.setTextDataId(id);
+    }
+
+    public long getTextDataId() {
+        return mNoteData.mTextDataId;
+    }
+
+    public void setCallDataId(long id) {
+        mNoteData.setCallDataId(id);
+    }
+
+    public void setCallData(String key, String value) {
+        mNoteData.setCallData(key, value);
+    }
+
+    public boolean isLocalModified() {
+        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
+    }
+
+    public boolean syncNote(Context context, long noteId) {
+        if (noteId <= 0) {
+            throw new IllegalArgumentException("Wrong note id:" + noteId);
+        }
+
+        if (!isLocalModified()) {
+            return true;
+        }
+
+        /**
+         * In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
+         * {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
+         * note data info
+         */
+        if (context.getContentResolver().update(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
+                null) == 0) {
+            Log.e(TAG, "Update note error, should not happen");
+            // Do not return, fall through
+        }
+        mNoteDiffValues.clear();
+
+        if (mNoteData.isLocalModified()
+                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private class NoteData {
+        private long mTextDataId;
+
+        private ContentValues mTextDataValues;
+
+        private long mCallDataId;
+
+        private ContentValues mCallDataValues;
+
+        private static final String TAG = "NoteData";
+
+        public NoteData() {
+            mTextDataValues = new ContentValues();
+            mCallDataValues = new ContentValues();
+            mTextDataId = 0;
+            mCallDataId = 0;
+        }
+
+        boolean isLocalModified() {
+            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
+        }
+
+        void setTextDataId(long id) {
+            if(id <= 0) {
+                throw new IllegalArgumentException("Text data id should larger than 0");
+            }
+            mTextDataId = id;
+        }
+
+        void setCallDataId(long id) {
+            if (id <= 0) {
+                throw new IllegalArgumentException("Call data id should larger than 0");
+            }
+            mCallDataId = id;
+        }
+
+        void setCallData(String key, String value) {
+            mCallDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        void setTextData(String key, String value) {
+            mTextDataValues.put(key, value);
+            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
+            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
+        }
+
+        Uri pushIntoContentResolver(Context context, long noteId) {
+            /**
+             * Check for safety
+             */
+            if (noteId <= 0) {
+                throw new IllegalArgumentException("Wrong note id:" + noteId);
+            }
+
+            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+            ContentProviderOperation.Builder builder = null;
+
+            if(mTextDataValues.size() > 0) {
+                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mTextDataId == 0) {
+                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mTextDataValues);
+                    try {
+                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new text data fail with noteId" + noteId);
+                        mTextDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mTextDataId));
+                    builder.withValues(mTextDataValues);
+                    operationList.add(builder.build());
+                }
+                mTextDataValues.clear();
+            }
+
+            if(mCallDataValues.size() > 0) {
+                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
+                if (mCallDataId == 0) {
+                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
+                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
+                            mCallDataValues);
+                    try {
+                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "Insert new call data fail with noteId" + noteId);
+                        mCallDataValues.clear();
+                        return null;
+                    }
+                } else {
+                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
+                            Notes.CONTENT_DATA_URI, mCallDataId));
+                    builder.withValues(mCallDataValues);
+                    operationList.add(builder.build());
+                }
+                mCallDataValues.clear();
+            }
+
+            if (operationList.size() > 0) {
+                try {
+                    ContentProviderResult[] results = context.getContentResolver().applyBatch(
+                            Notes.AUTHORITY, operationList);
+                    return (results == null || results.length == 0 || results[0] == null) ? null
+                            : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
+                } catch (RemoteException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                } catch (OperationApplicationException e) {
+                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+                    return null;
+                }
+            }
+            return null;
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/model/WorkingNote.java

@@ -0,0 +1,368 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.model;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentUris;
+import android.content.Context;
+import android.database.Cursor;
+import android.text.TextUtils;
+import android.util.Log;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.CallNote;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.DataConstants;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.data.Notes.TextNote;
+import net.micode.xiaomi_note.tool.ResourceParser.NoteBgResources;
+
+
+public class WorkingNote {
+    // Note for the working note
+    private Note mNote;
+    // Note Id
+    private long mNoteId;
+    // Note content
+    private String mContent;
+    // Note mode
+    private int mMode;
+
+    private long mAlertDate;
+
+    private long mModifiedDate;
+
+    private int mBgColorId;
+
+    private int mWidgetId;
+
+    private int mWidgetType;
+
+    private long mFolderId;
+
+    private Context mContext;
+
+    private static final String TAG = "WorkingNote";
+
+    private boolean mIsDeleted;
+
+    private NoteSettingChangedListener mNoteSettingStatusListener;
+
+    public static final String[] DATA_PROJECTION = new String[] {
+            DataColumns.ID,
+            DataColumns.CONTENT,
+            DataColumns.MIME_TYPE,
+            DataColumns.DATA1,
+            DataColumns.DATA2,
+            DataColumns.DATA3,
+            DataColumns.DATA4,
+    };
+
+    public static final String[] NOTE_PROJECTION = new String[] {
+            NoteColumns.PARENT_ID,
+            NoteColumns.ALERTED_DATE,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.WIDGET_ID,
+            NoteColumns.WIDGET_TYPE,
+            NoteColumns.MODIFIED_DATE
+    };
+
+    private static final int DATA_ID_COLUMN = 0;
+
+    private static final int DATA_CONTENT_COLUMN = 1;
+
+    private static final int DATA_MIME_TYPE_COLUMN = 2;
+
+    private static final int DATA_MODE_COLUMN = 3;
+
+    private static final int NOTE_PARENT_ID_COLUMN = 0;
+
+    private static final int NOTE_ALERTED_DATE_COLUMN = 1;
+
+    private static final int NOTE_BG_COLOR_ID_COLUMN = 2;
+
+    private static final int NOTE_WIDGET_ID_COLUMN = 3;
+
+    private static final int NOTE_WIDGET_TYPE_COLUMN = 4;
+
+    private static final int NOTE_MODIFIED_DATE_COLUMN = 5;
+
+    // New note construct
+    private WorkingNote(Context context, long folderId) {
+        mContext = context;
+        mAlertDate = 0;
+        mModifiedDate = System.currentTimeMillis();
+        mFolderId = folderId;
+        mNote = new Note();
+        mNoteId = 0;
+        mIsDeleted = false;
+        mMode = 0;
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
+    }
+
+    // Existing note construct
+    private WorkingNote(Context context, long noteId, long folderId) {
+        mContext = context;
+        mNoteId = noteId;
+        mFolderId = folderId;
+        mIsDeleted = false;
+        mNote = new Note();
+        loadNote();
+    }
+
+    private void loadNote() {
+        Cursor cursor = mContext.getContentResolver().query(
+                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mNoteId), NOTE_PROJECTION, null,
+                null, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                mFolderId = cursor.getLong(NOTE_PARENT_ID_COLUMN);
+                mBgColorId = cursor.getInt(NOTE_BG_COLOR_ID_COLUMN);
+                mWidgetId = cursor.getInt(NOTE_WIDGET_ID_COLUMN);
+                mWidgetType = cursor.getInt(NOTE_WIDGET_TYPE_COLUMN);
+                mAlertDate = cursor.getLong(NOTE_ALERTED_DATE_COLUMN);
+                mModifiedDate = cursor.getLong(NOTE_MODIFIED_DATE_COLUMN);
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No note with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note with id " + mNoteId);
+        }
+        loadNoteData();
+    }
+
+    private void loadNoteData() {
+        Cursor cursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, DATA_PROJECTION,
+                DataColumns.NOTE_ID + "=?", new String[] {
+                    String.valueOf(mNoteId)
+                }, null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                do {
+                    String type = cursor.getString(DATA_MIME_TYPE_COLUMN);
+                    if (DataConstants.NOTE.equals(type)) {
+                        mContent = cursor.getString(DATA_CONTENT_COLUMN);
+                        mMode = cursor.getInt(DATA_MODE_COLUMN);
+                        mNote.setTextDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else if (DataConstants.CALL_NOTE.equals(type)) {
+                        mNote.setCallDataId(cursor.getLong(DATA_ID_COLUMN));
+                    } else {
+                        Log.d(TAG, "Wrong note type with type:" + type);
+                    }
+                } while (cursor.moveToNext());
+            }
+            cursor.close();
+        } else {
+            Log.e(TAG, "No data with id:" + mNoteId);
+            throw new IllegalArgumentException("Unable to find note's data with id " + mNoteId);
+        }
+    }
+
+    public static WorkingNote createEmptyNote(Context context, long folderId, int widgetId,
+            int widgetType, int defaultBgColorId) {
+        WorkingNote note = new WorkingNote(context, folderId);
+        note.setBgColorId(defaultBgColorId);
+        note.setWidgetId(widgetId);
+        note.setWidgetType(widgetType);
+        return note;
+    }
+
+    public static WorkingNote load(Context context, long id) {
+        return new WorkingNote(context, id, 0);
+    }
+
+    public synchronized boolean saveNote() {
+        if (isWorthSaving()) {
+            if (!existInDatabase()) {
+                if ((mNoteId = Note.getNewNoteId(mContext, mFolderId)) == 0) {
+                    Log.e(TAG, "Create new note fail with id:" + mNoteId);
+                    return false;
+                }
+            }
+
+            mNote.syncNote(mContext, mNoteId);
+
+            /**
+             * Update widget content if there exist any widget of this note
+             */
+            if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                    && mWidgetType != Notes.TYPE_WIDGET_INVALIDE
+                    && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    public boolean existInDatabase() {
+        return mNoteId > 0;
+    }
+
+    private boolean isWorthSaving() {
+        if (mIsDeleted || (!existInDatabase() && TextUtils.isEmpty(mContent))
+                || (existInDatabase() && !mNote.isLocalModified())) {
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    public void setOnSettingStatusChangedListener(NoteSettingChangedListener l) {
+        mNoteSettingStatusListener = l;
+    }
+
+    public void setAlertDate(long date, boolean set) {
+        if (date != mAlertDate) {
+            mAlertDate = date;
+            mNote.setNoteValue(NoteColumns.ALERTED_DATE, String.valueOf(mAlertDate));
+        }
+        if (mNoteSettingStatusListener != null) {
+            mNoteSettingStatusListener.onClockAlertChanged(date, set);
+        }
+    }
+
+    public void markDeleted(boolean mark) {
+        mIsDeleted = mark;
+        if (mWidgetId != AppWidgetManager.INVALID_APPWIDGET_ID
+                && mWidgetType != Notes.TYPE_WIDGET_INVALIDE && mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onWidgetChanged();
+        }
+    }
+
+    public void setBgColorId(int id) {
+        if (id != mBgColorId) {
+            mBgColorId = id;
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onBackgroundColorChanged();
+            }
+            mNote.setNoteValue(NoteColumns.BG_COLOR_ID, String.valueOf(id));
+        }
+    }
+
+    public void setCheckListMode(int mode) {
+        if (mMode != mode) {
+            if (mNoteSettingStatusListener != null) {
+                mNoteSettingStatusListener.onCheckListModeChanged(mMode, mode);
+            }
+            mMode = mode;
+            mNote.setTextData(TextNote.MODE, String.valueOf(mMode));
+        }
+    }
+
+    public void setWidgetType(int type) {
+        if (type != mWidgetType) {
+            mWidgetType = type;
+            mNote.setNoteValue(NoteColumns.WIDGET_TYPE, String.valueOf(mWidgetType));
+        }
+    }
+
+    public void setWidgetId(int id) {
+        if (id != mWidgetId) {
+            mWidgetId = id;
+            mNote.setNoteValue(NoteColumns.WIDGET_ID, String.valueOf(mWidgetId));
+        }
+    }
+
+    public void setWorkingText(String text) {
+        if (!TextUtils.equals(mContent, text)) {
+            mContent = text;
+            mNote.setTextData(DataColumns.CONTENT, mContent);
+        }
+    }
+
+    public void convertToCallNote(String phoneNumber, long callDate) {
+        mNote.setCallData(CallNote.CALL_DATE, String.valueOf(callDate));
+        mNote.setCallData(CallNote.PHONE_NUMBER, phoneNumber);
+        mNote.setNoteValue(NoteColumns.PARENT_ID, String.valueOf(Notes.ID_CALL_RECORD_FOLDER));
+    }
+
+    public boolean hasClockAlert() {
+        return (mAlertDate > 0 ? true : false);
+    }
+
+    public String getContent() {
+        return mContent;
+    }
+
+    public long getAlertDate() {
+        return mAlertDate;
+    }
+
+    public long getModifiedDate() {
+        return mModifiedDate;
+    }
+
+    public int getBgColorResId() {
+        return NoteBgResources.getNoteBgResource(mBgColorId);
+    }
+
+    public int getBgColorId() {
+        return mBgColorId;
+    }
+
+    public int getTitleBgResId() {
+        return NoteBgResources.getNoteTitleBgResource(mBgColorId);
+    }
+
+    public int getCheckListMode() {
+        return mMode;
+    }
+
+    public long getNoteId() {
+        return mNoteId;
+    }
+
+    public long getFolderId() {
+        return mFolderId;
+    }
+
+    public int getWidgetId() {
+        return mWidgetId;
+    }
+
+    public int getWidgetType() {
+        return mWidgetType;
+    }
+
+    public interface NoteSettingChangedListener {
+        /**
+         * Called when the background color of current note has just changed
+         */
+        void onBackgroundColorChanged();
+
+        /**
+         * Called when user set clock
+         */
+        void onClockAlertChanged(long date, boolean set);
+
+        /**
+         * Call when user create note from widget
+         */
+        void onWidgetChanged();
+
+        /**
+         * Call when switch between check list mode and normal mode
+         * @param oldMode is previous mode before change
+         * @param newMode is new mode
+         */
+        void onCheckListModeChanged(int oldMode, int newMode);
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/tool/BackupUtils.java

@@ -0,0 +1,359 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// 备份工具类，用于处理小米便签数据的备份操作
+package net.micode.xiaomi_note.tool;
+
+// 导入必要的Android上下文、数据库游标、文件系统相关类等
+import android.content.Context;
+import android.database.Cursor;
+import android.os.Environment;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.util.Log;
+
+// 导入应用资源、便签数据相关的类和常量
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.DataColumns;
+import net.micode.xiaomi_note.data.Notes.DataConstants;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+
+// 导入Java文件系统操作类
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+// BackupUtils.java
+
+public class BackupUtils {
+    private static final String TAG = "BackupUtils"; // 日志标签，用于调试信息输出
+    // Singleton stuff
+    private static BackupUtils sInstance; // 单例实例
+
+    public static synchronized BackupUtils getInstance(Context context) { // 获取单例实例的方法
+        if (sInstance == null) { // 如果实例为空，则创建新实例
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance; // 返回单例实例
+    }
+
+    /**
+     * Following states are signs to represents backup or restore
+     * status
+     */
+    // Currently, the sdcard is not mounted
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0; // SD卡未挂载状态
+    // The backup file not exist
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1; // 备份文件不存在状态
+    // The data is not well formated, may be changed by other programs
+    public static final int STATE_DATA_DESTROIED               = 2; // 数据格式损坏状态
+    // Some run-time exception which causes restore or backup fails
+    public static final int STATE_SYSTEM_ERROR                 = 3; // 系统错误状态
+    // Backup or restore success
+    public static final int STATE_SUCCESS                      = 4; // 操作成功状态
+
+    private TextExport mTextExport; // 文本导出工具类实例
+
+    private BackupUtils(Context context) { // 私有构造函数，防止外部实例化
+        mTextExport = new TextExport(context); // 初始化文本导出工具类
+    }
+
+    private static boolean externalStorageAvailable() { // 判断外部存储是否可用
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()); // 返回布尔值表示存储状态
+    }
+
+    public int exportToText() { // 导出数据到文本的方法
+        return mTextExport.exportToText(); // 调用内部TextExport类的导出方法
+    }
+
+    public String getExportedTextFileName() { // 获取导出文本文件名的方法
+        return mTextExport.mFileName; // 返回文件名
+    }
+
+    public String getExportedTextFileDir() { // 获取导出文本文件目录的方法
+        return mTextExport.mFileDirectory; // 返回文件目录
+    }
+
+    private static class TextExport { // 内部类，用于处理文本导出相关逻辑
+        private static final String[] NOTE_PROJECTION = { // 查询笔记时使用的列投影
+                NoteColumns.ID,
+                NoteColumns.MODIFIED_DATE,
+                NoteColumns.SNIPPET,
+                NoteColumns.TYPE
+        };
+
+        private static final int NOTE_COLUMN_ID = 0; // 笔记ID列索引
+        private static final int NOTE_COLUMN_MODIFIED_DATE = 1; // 修改日期列索引
+        private static final int NOTE_COLUMN_SNIPPET = 2; // 摘录列索引
+        private static final int NOTE_COLUMN_TYPE = 3; // 类型列索引
+
+        private static final String[] DATA_PROJECTION = { // 查询数据时使用的列投影
+                DataColumns.CONTENT,
+                DataColumns.MIME_TYPE,
+                DataColumns.DATA1,
+                DataColumns.DATA2,
+                DataColumns.DATA3,
+                DataColumns.DATA4,
+        };
+
+        private static final int DATA_COLUMN_CONTENT = 0; // 内容列索引
+        private static final int DATA_COLUMN_MIME_TYPE = 1; // MIME类型列索引
+        private static final int DATA_COLUMN_CALL_DATE = 2; // 呼叫日期列索引
+        private static final int DATA_COLUMN_PHONE_NUMBER = 4; // 电话号码列索引
+
+        private final String [] TEXT_FORMAT; // 文本格式数组
+        private static final int FORMAT_FOLDER_NAME          = 0; // 文件夹名称格式索引
+        private static final int FORMAT_NOTE_DATE            = 1; // 笔记日期格式索引
+        private static final int FORMAT_NOTE_CONTENT         = 2; // 笔记内容格式索引
+
+        private Context mContext; // 上下文对象
+        private String mFileName; // 导出文件名
+        private String mFileDirectory; // 导出文件目录
+
+        public TextExport(Context context) { // 构造函数，初始化上下文和其他变量
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note); // 加载文本格式
+            mContext = context; // 设置上下文
+            mFileName = ""; // 初始化文件名为空
+            mFileDirectory = ""; // 初始化文件目录为空
+        }
+
+        private String getFormat(int id) { // 根据索引获取格式字符串的方法
+            return TEXT_FORMAT[id]; // 返回指定索引的格式字符串
+        }
+
+        /**
+         * Export the folder identified by folder id to text
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) { // 将文件夹导出为文本的方法
+            // Query notes belong to this folder
+            Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI, // 查询属于该文件夹的笔记
+                    NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
+                            folderId
+                    }, null);
+
+            if (notesCursor != null) { // 如果游标不为空
+                if (notesCursor.moveToFirst()) { // 如果有数据
+                    do { // 遍历所有笔记
+                        // Print note's last modified date
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format( // 打印笔记最后修改日期
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = notesCursor.getString(NOTE_COLUMN_ID); // 获取笔记ID
+                        exportNoteToText(noteId, ps); // 导出笔记内容
+                    } while (notesCursor.moveToNext());
+                }
+                notesCursor.close(); // 关闭游标
+            }
+        }
+
+        /**
+         * Export note identified by id to a print stream
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) { // 将笔记导出为文本的方法
+            Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI, // 查询笔记的数据
+                    DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
+                            noteId
+                    }, null);
+
+            if (dataCursor != null) { // 如果游标不为空
+                if (dataCursor.moveToFirst()) { // 如果有数据
+                    do { // 遍历所有数据
+                        String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE); // 获取MIME类型
+                        if (DataConstants.CALL_NOTE.equals(mimeType)) { // 如果是通话记录笔记
+                            // Print phone number
+                            String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER); // 获取电话号码
+                            long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE); // 获取呼叫日期
+                            String location = dataCursor.getString(DATA_COLUMN_CONTENT); // 获取位置信息
+
+                            if (!TextUtils.isEmpty(phoneNumber)) { // 如果电话号码不为空
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), phoneNumber)); // 打印电话号码
+                            }
+                            // Print call date
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat.format( // 打印呼叫日期
+                                    mContext.getString(R.string.format_datetime_mdhm),
+                                    callDate)));
+                            // Print call attachment location
+                            if (!TextUtils.isEmpty(location)) { // 如果位置信息不为空
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), location)); // 打印位置信息
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) { // 如果是普通笔记
+                            String content = dataCursor.getString(DATA_COLUMN_CONTENT); // 获取笔记内容
+                            if (!TextUtils.isEmpty(content)) { // 如果内容不为空
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), content)); // 打印笔记内容
+                            }
+                        }
+                    } while (dataCursor.moveToNext());
+                }
+                dataCursor.close(); // 关闭游标
+            }
+            // print a line separator between note
+            try {
+                ps.write(new byte[] { // 在笔记之间打印分隔符
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) { // 捕获IO异常
+                Log.e(TAG, e.toString()); // 记录错误日志
+            }
+        }
+
+        /**
+         * Note will be exported as text which is user readable
+         */
+        public int exportToText() { // 导出笔记到文本的方法
+            if (!externalStorageAvailable()) { // 如果外部存储不可用
+                Log.d(TAG, "Media was not mounted"); // 记录警告日志
+                return STATE_SD_CARD_UNMOUONTED; // 返回SD卡未挂载状态码
+            }
+
+            PrintStream ps = getExportToTextPrintStream(); // 获取打印流
+            if (ps == null) { // 如果打印流为空
+                Log.e(TAG, "get print stream error"); // 记录错误日志
+                return STATE_SYSTEM_ERROR; // 返回系统错误状态码
+            }
+            // First export folder and its notes
+            Cursor folderCursor = mContext.getContentResolver().query( // 查询文件夹及其笔记
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    "(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
+                            + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
+                            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
+
+            if (folderCursor != null) { // 如果游标不为空
+                if (folderCursor.moveToFirst()) { // 如果有数据
+                    do { // 遍历所有文件夹
+                        // Print folder's name
+                        String folderName = "";
+                        if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
+                            folderName = mContext.getString(R.string.call_record_folder_name); // 设置文件夹名称
+                        } else {
+                            folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET); // 获取文件夹摘录
+                        }
+                        if (!TextUtils.isEmpty(folderName)) { // 如果文件夹名称不为空
+                            ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName)); // 打印文件夹名称
+                        }
+                        String folderId = folderCursor.getString(NOTE_COLUMN_ID); // 获取文件夹ID
+                        exportFolderToText(folderId, ps); // 导出文件夹及其笔记
+                    } while (folderCursor.moveToNext());
+                }
+                folderCursor.close(); // 关闭游标
+            }
+
+            // Export notes in root's folder
+            Cursor noteCursor = mContext.getContentResolver().query( // 查询根目录下的笔记
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+                            + "=0", null, null);
+
+            if (noteCursor != null) { // 如果游标不为空
+                if (noteCursor.moveToFirst()) { // 如果有数据
+                    do { // 遍历所有笔记
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format( // 打印笔记最后修改日期
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // Query data belong to this note
+                        String noteId = noteCursor.getString(NOTE_COLUMN_ID); // 获取笔记ID
+                        exportNoteToText(noteId, ps); // 导出笔记内容
+                    } while (noteCursor.moveToNext());
+                }
+                noteCursor.close(); // 关闭游标
+            }
+            ps.close(); // 关闭打印流
+
+            return STATE_SUCCESS; // 返回操作成功状态码
+        }
+
+        /**
+         * Get a print stream pointed to the file {@generateExportedTextFile}
+         */
+        private PrintStream getExportToTextPrintStream() { // 获取打印流的方法
+            File file = generateFileMountedOnSDcard(mContext, R.string.file_path, // 生成挂载在SD卡上的文件
+                    R.string.file_name_txt_format);
+            if (file == null) { // 如果文件为空
+                Log.e(TAG, "create file to exported failed"); // 记录错误日志
+                return null; // 返回空
+            }
+            mFileName = file.getName(); // 设置文件名
+            mFileDirectory = mContext.getString(R.string.file_path); // 设置文件目录
+            PrintStream ps = null; // 初始化打印流
+            try {
+                FileOutputStream fos = new FileOutputStream(file); // 创建文件输出流
+                ps = new PrintStream(fos); // 创建打印流
+            } catch (FileNotFoundException e) { // 捕获文件未找到异常
+                e.printStackTrace(); // 打印堆栈信息
+                return null; // 返回空
+            } catch (NullPointerException e) { // 捕获空指针异常
+                e.printStackTrace(); // 打印堆栈信息
+                return null; // 返回空
+            }
+            return ps; // 返回打印流
+        }
+    }
+
+
+   /**
+     * Generate the text file to store imported data
+   */
+   private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
+     // 创建一个StringBuilder对象用于拼接文件路径字符串
+      StringBuilder sb = new StringBuilder();
+
+     // 将外部存储目录路径追加到StringBuilder中
+      sb.append(Environment.getExternalStorageDirectory());
+
+     // 追加通过资源ID获取的文件夹路径字符串
+      sb.append(context.getString(filePathResId));
+      // 将StringBuilder转换为File对象，表示目标文件夹
+     File filedir = new File(sb.toString());
+
+     // 追加带有日期格式的文件名到StringBuilder中
+     sb.append(context.getString(
+             fileNameFormatResId,
+             DateFormat.format(context.getString(R.string.format_date_ymd),
+                     System.currentTimeMillis())));
+
+     // 将StringBuilder转换为File对象，表示目标文件
+     File file = new File(sb.toString());
+     try {
+         // 如果目标文件夹不存在，则尝试创建文件夹
+          if (!filedir.exists()) {
+              filedir.mkdir();
+          }
+
+         // 如果目标文件不存在，则尝试创建新文件
+          if (!file.exists()) {
+              file.createNewFile();
+          }
+
+         // 返回生成的目标文件对象
+          return file;
+     } catch (SecurityException e) {
+        // 捕获安全异常并打印堆栈信息
+          e.printStackTrace();
+     } catch (IOException e) {
+        // 捕获IO异常并打印堆栈信息
+         e.printStackTrace();
+     }
+
+    // 如果发生异常或失败，返回null
+    return null;
+   }
+}
+
+

src/app/src/main/java/net/micode/xiaomi_note/tool/DataUtils.java

@@ -0,0 +1,406 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// DataUtils.java 文件，位于 net.micode.xiaomi_note.tool 包下
+
+package net.micode.xiaomi_note.tool;
+
+// 导入 Android 平台相关的类，用于操作内容提供器、URI、值集等
+import android.content.ContentProviderOperation; // 用于构建批量操作指令
+import android.content.ContentProviderResult;    // 批量操作结果
+import android.content.ContentResolver;        // 访问内容提供器的核心接口
+import android.content.ContentUris;            // 提供 URI 操作工具方法
+import android.content.ContentValues;          // 用于存储键值对数据
+import android.content.OperationApplicationException; // 批量操作异常类
+import android.database.Cursor;                // 用于查询数据库结果集
+import android.os.RemoteException;             // 远程调用异常类
+import android.util.Log;                       // 日志记录工具
+
+// 导入项目内部自定义的数据模型和 UI 相关类
+import net.micode.xiaomi_note.data.Notes;       // Notes 数据模型
+import net.micode.xiaomi_note.data.Notes.CallNote; // CallNote 子类
+import net.micode.xiaomi_note.data.Notes.NoteColumns; // NoteColumns 静态常量类
+import net.micode.xiaomi_note.ui.NotesListAdapter.AppWidgetAttribute; // AppWidgetAttribute 类
+
+// 导入 Java 标准库集合类，用于处理集合操作
+import java.util.ArrayList;                    // 动态数组
+import java.util.HashSet;                      // 哈希集合
+
+
+public class DataUtils {
+    // 定义日志标签，用于调试信息输出
+    public static final String TAG = "DataUtils";
+
+    /**
+     * 批量删除笔记内容
+     * @param resolver ContentResolver对象，用于执行数据库操作
+     * @param ids 包含要删除的笔记ID的HashSet集合
+     * @return 如果删除成功返回true，否则返回false
+     */
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+        // 如果传入的ids为空，则记录日志并返回true（可能表示无需操作）
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        // 如果ids集合中没有元素，则记录日志并返回true
+        if (ids.size() == 0) {
+            Log.d(TAG, "no id is in the hashset");
+            return true;
+        }
+
+        // 创建一个列表用于存储批量操作的命令
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+
+        // 遍历ids集合中的每个id
+        for (long id : ids) {
+            // 如果id是系统根文件夹ID，则跳过该条目
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+
+            // 构建删除指定ID笔记的ContentProviderOperation
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            // 将构建好的操作添加到操作列表中
+            operationList.add(builder.build());
+        }
+
+        try {
+            // 执行批量操作
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+
+            // 如果结果为空或操作失败，则记录日志并返回false
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+
+            // 操作成功返回true
+            return true;
+        } catch (RemoteException e) {
+            // 捕获远程异常并记录详细错误信息
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            // 捕获操作应用异常并记录详细错误信息
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+
+        // 异常情况下返回false
+        return false;
+    }
+
+
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        // 创建一个ContentValues对象用于存储更新字段及其值
+        ContentValues values = new ContentValues();
+
+        // 设置目标文件夹ID到NoteColumns.PARENT_ID字段
+        values.put(NoteColumns.PARENT_ID, desFolderId);
+
+        // 设置源文件夹ID到NoteColumns.ORIGIN_PARENT_ID字段
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
+
+        // 设置本地修改标志位为1，表示该笔记已被修改
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+
+        // 使用ContentResolver更新指定ID的笔记数据，更新字段由values定义
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+    }
+
+    public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
+                                            long folderId) {
+        // 判断传入的ids集合是否为空
+        if (ids == null) {
+            // 如果ids为空，记录日志并返回true（可能表示操作成功）
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        // 初始化一个操作列表，用于批量更新数据库
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+
+        // 遍历ids集合中的每个id
+        for (long id : ids) {
+            // 创建ContentProviderOperation的Builder对象，用于构建批量更新操作
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+
+            // 设置目标文件夹ID到NoteColumns.PARENT_ID字段
+            builder.withValue(NoteColumns.PARENT_ID, folderId);
+
+            // 设置本地修改标志位为1，表示该笔记已被修改
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
+
+            // 将构建完成的操作添加到操作列表中
+            operationList.add(builder.build());
+        }
+
+        try {
+            // 执行批量更新操作
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+
+            // 检查结果是否为空或无效，若无效则记录日志并返回false
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            // 如果操作成功，返回true
+            return true;
+        } catch (RemoteException e) {
+            // 捕获远程异常并记录日志
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            // 捕获操作应用异常并记录日志
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        // 如果发生异常，返回false
+        return false;
+    }
+
+    /**
+     * 获取用户文件夹数量（排除系统文件夹）
+     * @param resolver ContentResolver对象，用于查询内容提供者的数据
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {
+        // 查询所有符合条件的文件夹记录数
+        Cursor cursor = resolver.query(
+                Notes.CONTENT_NOTE_URI,                  // 内容URI，指定查询的数据来源
+                new String[] { "COUNT(*)" },             // 投影，这里只查询记录总数
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<?", // 查询条件：类型等于普通文件夹且父ID不等于回收站ID
+                new String[] {                           // 查询参数，替换占位符
+                        String.valueOf(Notes.TYPE_FOLDER),   // 文件夹类型
+                        String.valueOf(Notes.ID_TRASH_FOLER) // 回收站ID
+                },
+                null                                     // 不使用排序
+        );
+
+        int count = 0; // 初始化文件夹计数器
+        if(cursor != null) { // 如果查询结果非空
+            if(cursor.moveToFirst()) { // 移动到查询结果的第一行
+                try {
+                    count = cursor.getInt(0); // 获取第一条记录中的计数值
+                } catch (IndexOutOfBoundsException e) {
+                    // 捕获异常，记录错误日志
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close(); // 关闭游标，释放资源
+                }
+            }
+        }
+        return count; // 返回用户文件夹数量
+    }
+
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        // 查询指定 noteId 的笔记记录，并筛选条件为类型匹配且父文件夹不是回收站
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)}, // 类型参数作为查询条件
+                null);
+
+        boolean exist = false; // 初始化存在标志位
+        if (cursor != null) { // 检查游标是否为空
+            if (cursor.getCount() > 0) { // 如果查询结果数量大于 0，则表示存在符合条件的记录
+                exist = true;
+            }
+            cursor.close(); // 关闭游标释放资源
+        }
+        return exist; // 返回是否存在符合条件的记录
+    }
+
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
+        // 使用 ContentResolver 查询指定 ID 的笔记数据
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+
+        // 初始化是否存在标志位
+        boolean exist = false;
+        if (cursor != null) { // 检查游标是否为空
+            if (cursor.getCount() > 0) { // 判断查询结果是否有数据
+                exist = true; // 如果有数据，则设置存在标志为 true
+            }
+            cursor.close(); // 关闭游标释放资源
+        }
+        return exist; // 返回是否存在结果
+    }
+
+    // 判断指定ID的数据是否存在于ContentProvider的数据库中
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
+        // 使用ContentResolver查询指定ID的数据URI
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                null, null, null, null);
+
+        boolean exist = false; // 初始化标识变量，用于记录数据是否存在
+        if (cursor != null) { // 检查Cursor对象是否为空
+            if (cursor.getCount() > 0) { // 如果查询结果数量大于0，则表示数据存在
+                exist = true;
+            }
+            cursor.close(); // 关闭Cursor对象以释放资源
+        }
+        return exist; // 返回数据是否存在
+    }
+
+    // 定义一个静态方法，用于检查指定名称的文件夹是否在ContentResolver中存在且可见
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        // 使用ContentResolver查询符合特定条件的笔记数据
+        Cursor cursor = resolver.query(
+                Notes.CONTENT_NOTE_URI,         // 指定查询的URI，表示笔记内容的数据库表
+                null,                           // 查询所有列（null表示不指定具体列）
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER, // 条件：类型必须是文件夹类型
+                new String[] { name },          // 查询参数，指定文件夹名称
+                NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 条件：父ID不能等于回收站文件夹ID
+        );
+        boolean exist = false;              // 初始化标志位，用于判断文件夹是否存在
+        if(cursor != null) {                // 如果Cursor对象不为空
+            if(cursor.getCount() > 0) {     // 如果查询结果数量大于0，说明存在符合条件的记录
+                exist = true;               // 设置标志位为true
+            }
+            cursor.close();                 // 关闭游标，释放资源
+        }
+        return exist;                       // 返回文件夹是否存在
+    }
+
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        // 查询 ContentProvider 中与指定文件夹 ID 对应的便签小部件数据
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },  // 投影：需要查询的列
+                NoteColumns.PARENT_ID + "=?",  // 条件：parentId 等于 folderId
+                new String[] { String.valueOf(folderId) },  // 参数：folderId 的值
+                null);  // 不指定排序
+
+        // 初始化结果集合
+        HashSet<AppWidgetAttribute> set = null;
+        if (c != null) {
+            // 如果游标有数据，则移动到第一条记录
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();  // 创建一个空的集合用于存储结果
+                do {
+                    try {
+                        // 创建 AppWidgetAttribute 对象以存储查询结果
+                        AppWidgetAttribute widget = new AppWidgetAttribute();
+                        widget.widgetId = c.getInt(0);  // 获取小部件 ID
+                        widget.widgetType = c.getInt(1);  // 获取小部件类型
+                        set.add(widget);  // 将小部件信息添加到集合中
+                    } catch (IndexOutOfBoundsException e) {
+                        // 捕获索引越界异常，记录错误日志
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());  // 遍历游标中的所有记录
+            }
+            c.close();  // 关闭游标释放资源
+        }
+        return set;  // 返回包含小部件信息的集合
+    }
+
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
+        // 查询 ContentProvider 中的数据，指定 URI、需要查询的列、查询条件、条件参数以及排序方式
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.PHONE_NUMBER }, // 查询目标列：电话号码
+                CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?", // 查询条件：noteId 和 MIME 类型匹配
+                new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE }, // 条件参数
+                null); // 不指定排序
+
+        // 判断游标是否为空且是否有数据可读
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                // 尝试获取查询结果的第一列（电话号码）作为字符串返回
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {
+                // 如果索引越界，记录错误日志
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                // 确保游标关闭，释放资源
+                cursor.close();
+            }
+        }
+        // 如果没有找到数据或发生异常，返回空字符串
+        return "";
+    }
+
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        // 查询 ContentProvider 中的数据，筛选条件为通话日期、MIME 类型和电话号码
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.NOTE_ID }, // 查询目标列：笔记 ID
+                CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                        + CallNote.PHONE_NUMBER + ",?)", // 查询条件：通话日期匹配、MIME 类型匹配、电话号码匹配
+                new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber }, // 条件参数
+                null); // 不指定排序
+
+        if (cursor != null) {
+            // 如果查询结果存在且有数据行
+            if (cursor.moveToFirst()) {
+                try {
+                    // 尝试获取第一行数据中的笔记 ID（长整型）
+                    return cursor.getLong(0);
+                } catch (IndexOutOfBoundsException e) {
+                    // 如果获取失败，记录错误日志
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            // 关闭游标释放资源
+            cursor.close();
+        }
+        // 如果未找到符合条件的笔记 ID，则返回默认值 0
+        return 0;
+    }
+
+    public static String getSnippetById(ContentResolver resolver, long noteId) {
+        // 使用 ContentResolver 查询指定 ID 的笔记片段数据
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String [] { NoteColumns.SNIPPET },  // 查询目标列：仅获取笔记片段字段
+                NoteColumns.ID + "=?",                  // 条件语句：ID 等于指定值
+                new String [] { String.valueOf(noteId)},// 替换占位符的参数：将 noteId 转为字符串
+                null);                                 // 不设置排序参数
+
+        if (cursor != null) {
+            String snippet = "";  // 初始化笔记片段变量
+            // 如果查询结果存在数据，则移动游标到第一条记录
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);  // 获取第一条记录的笔记片段字段值
+            }
+            cursor.close();  // 关闭游标释放资源
+            return snippet;  // 返回查询到的笔记片段
+        }
+        // 如果未找到对应笔记 ID，抛出异常
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+    }
+
+    /**
+     * 获取字符串的格式化片段
+     * @param snippet 原始字符串
+     * @return 返回处理后的字符串，如果原始字符串为null则返回null，
+     *         如果包含换行符，则截取到第一个换行符之前的部分，否则返回原字符串去除首尾空格后的结果
+     */
+    public static String getFormattedSnippet(String snippet) {
+        // 检查输入字符串是否为null
+        if (snippet != null) {
+            // 去除字符串首尾的空白字符
+            snippet = snippet.trim();
+            // 查找字符串中第一个换行符的位置
+            int index = snippet.indexOf('\n');
+            // 如果找到换行符
+            if (index != -1) {
+                // 截取字符串从起始位置到换行符之前的部分
+                snippet = snippet.substring(0, index);
+            }
+        }
+        // 返回处理后的字符串
+        return snippet;
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/tool/GTaskStringUtils.java

@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// 定义一个名为GTaskStringUtils的公共类，位于net.micode.xiaomi_note.tool包中
+package net.micode.xiaomi_note.tool;
+
+public class GTaskStringUtils {
+
+    // 定义一个常量字符串，表示JSON数据中操作ID的键值
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+
+    // 定义一个常量字符串，表示JSON数据中操作列表的键值
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+
+    // 定义一个常量字符串，表示JSON数据中操作类型的键值
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+
+    // 定义一个常量字符串，表示创建操作类型的值
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+
+    // 定义一个常量字符串，表示获取所有任务的操作类型的值
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+
+    // 定义一个常量字符串，表示移动操作类型的值
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+
+    // 定义一个常量字符串，表示更新操作类型的值
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+
+    // 定义一个常量字符串，表示创建者的ID键值
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+
+    // 定义一个常量字符串，表示子实体的键值
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+
+    // 定义一个常量字符串，表示客户端版本的键值
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+
+    // 定义一个常量字符串，表示任务是否完成的键值
+    public final static String GTASK_JSON_COMPLETED = "completed";
+
+    // 定义一个常量字符串，表示当前列表ID的键值
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+
+    // 定义一个常量字符串，表示默认列表ID的键值
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+
+    // 定义一个常量字符串，表示是否删除的键值
+    public final static String GTASK_JSON_DELETED = "deleted";
+
+    // 定义一个常量字符串，表示目标列表的键值
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+
+    // 定义一个常量字符串，表示目标父节点的键值
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+
+    // 定义一个常量字符串，表示目标父节点类型的键值
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+
+    // 定义一个常量字符串，表示实体差异的键值
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+
+    // 定义一个常量字符串，表示实体类型的键值
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+
+    // 定义一个常量字符串，表示获取已删除任务的键值
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+
+    // 定义一个常量字符串，表示任务ID的键值
+    public final static String GTASK_JSON_ID = "id";
+
+    // 定义一个常量字符串，表示任务索引的键值
+    public final static String GTASK_JSON_INDEX = "index";
+
+    // 定义一个常量字符串，表示最后修改时间的键值
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+
+    // 定义一个常量字符串，表示最新同步点的键值
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+
+    // 定义一个常量字符串，表示列表ID的键值
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+
+    // 定义一个常量字符串，表示列表集合的键值
+    public final static String GTASK_JSON_LISTS = "lists";
+
+    // 定义一个常量字符串，表示任务名称的键值
+    public final static String GTASK_JSON_NAME = "name";
+
+    // 定义一个常量字符串，表示新ID的键值
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+
+    // 定义一个常量字符串，表示任务备注的键值
+    public final static String GTASK_JSON_NOTES = "notes";
+
+    // 定义一个常量字符串，表示父任务ID的键值
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+
+    // 定义一个常量字符串，表示前序兄弟任务ID的键值
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+
+    // 定义一个常量字符串，表示结果集的键值
+    public final static String GTASK_JSON_RESULTS = "results";
+
+    // 定义一个常量字符串，表示源列表的键值
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+
+    // 定义一个常量字符串，表示任务集合的键值
+    public final static String GTASK_JSON_TASKS = "tasks";
+
+    // 定义一个常量字符串，表示类型（如任务或分组）的键值
+    public final static String GTASK_JSON_TYPE = "type";
+
+    // 定义一个常量字符串，表示分组类型的值
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+
+    // 定义一个常量字符串，表示任务类型的值
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+
+    // 定义一个常量字符串，表示用户信息的键值
+    public final static String GTASK_JSON_USER = "user";
+
+    // 定义一个常量字符串，表示小米笔记文件夹前缀
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+
+    // 定义一个常量字符串，表示默认文件夹名称
+    public final static String FOLDER_DEFAULT = "Default";
+
+    // 定义一个常量字符串，表示通话记录文件夹名称
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+
+    // 定义一个常量字符串，表示元数据文件夹名称
+    public final static String FOLDER_META = "METADATA";
+
+    // 定义一个常量字符串，表示元数据头中的全局任务ID键值
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+
+    // 定义一个常量字符串，表示元数据头中的笔记键值
+    public final static String META_HEAD_NOTE = "meta_note";
+
+    // 定义一个常量字符串，表示元数据头中的数据键值
+    public final static String META_HEAD_DATA = "meta_data";
+
+    // 定义一个常量字符串，表示元数据笔记名称
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+
+}

src/app/src/main/java/net/micode/xiaomi_note/tool/ResourceParser.java

@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// 定义一个名为ResourceParser的公共类，位于net.micode.xiaomi_note.tool包中
+package net.micode.xiaomi_note.tool;
+
+// 导入必要的Android上下文和偏好设置管理类
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+// 导入项目中定义的资源文件和偏好设置活动类
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.ui.NotesPreferenceActivity;
+
+// 定义一个名为ResourceParser的公共类
+public class ResourceParser {
+
+    // 定义常量表示不同的颜色值，用于背景色配置
+    public static final int YELLOW           = 0; // 黄色
+    public static final int BLUE             = 1; // 蓝色
+    public static final int WHITE            = 2; // 白色
+    public static final int GREEN            = 3; // 绿色
+    public static final int RED              = 4; // 红色
+
+    // 定义默认背景色为黄色
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+
+    // 定义常量表示不同大小的文字样式
+    public static final int TEXT_SMALL       = 0; // 小号文字
+    public static final int TEXT_MEDIUM      = 1; // 中号文字
+    public static final int TEXT_LARGE       = 2; // 大号文字
+    public static final int TEXT_SUPER       = 3; // 特大号文字
+
+    // 定义默认字体大小为中号文字
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+
+
+    public static class NoteBgResources {
+        // 定义一个静态数组，存储编辑页面背景资源的引用
+        private final static int [] BG_EDIT_RESOURCES = new int [] {
+                R.drawable.edit_yellow,   // 黄色背景
+                R.drawable.edit_blue,     // 蓝色背景
+                R.drawable.edit_white,    // 白色背景
+                R.drawable.edit_green,    // 绿色背景
+                R.drawable.edit_red       // 红色背景
+        };
+
+        // 定义一个静态数组，存储编辑页面标题背景资源的引用
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {
+                R.drawable.edit_title_yellow, // 黄色标题背景
+                R.drawable.edit_title_blue,   // 蓝色标题背景
+                R.drawable.edit_title_white,  // 白色标题背景
+                R.drawable.edit_title_green,  // 绿色标题背景
+                R.drawable.edit_title_red     // 红色标题背景
+        };
+
+        // 根据传入的id获取对应的编辑页面背景资源
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+
+        // 根据传入的id获取对应的编辑页面标题背景资源
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+
+    // 定义一个静态方法，用于获取默认背景资源ID
+    public static int getDefaultBgId(Context context) {
+        // 检查SharedPreferences中是否启用了背景颜色设置
+        if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY, false)) {
+            // 如果启用，则通过随机数生成一个背景资源ID
+            return (int) (Math.random() * NoteBgResources.BG_EDIT_RESOURCES.length);
+        } else {
+            // 如果未启用，则返回默认背景颜色的常量值
+            return BG_DEFAULT_COLOR;
+        }
+    }
+
+    public static class NoteItemBgResources {
+        // 定义一个静态数组，存储第一部分背景资源的ID
+        private final static int [] BG_FIRST_RESOURCES = new int [] {
+                R.drawable.list_yellow_up,   // 黄色上部背景
+                R.drawable.list_blue_up,     // 蓝色上部背景
+                R.drawable.list_white_up,    // 白色上部背景
+                R.drawable.list_green_up,    // 绿色上部背景
+                R.drawable.list_red_up       // 红色上部背景
+        };
+
+        // 定义一个静态数组，存储中间部分背景资源的ID
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {
+                R.drawable.list_yellow_middle,  // 黄色中部背景
+                R.drawable.list_blue_middle,    // 蓝色中部背景
+                R.drawable.list_white_middle,   // 白色中部背景
+                R.drawable.list_green_middle,   // 绿色中部背景
+                R.drawable.list_red_middle      // 红色中部背景
+        };
+
+        // 定义一个静态数组，存储最后一部分背景资源的ID
+        private final static int [] BG_LAST_RESOURCES = new int [] {
+                R.drawable.list_yellow_down,    // 黄色下部背景
+                R.drawable.list_blue_down,      // 蓝色下部背景
+                R.drawable.list_white_down,     // 白色下部背景
+                R.drawable.list_green_down,     // 绿色下部背景
+                R.drawable.list_red_down        // 红色下部背景
+        };
+
+        // 定义一个静态数组，存储单一背景资源的ID
+        private final static int [] BG_SINGLE_RESOURCES = new int [] {
+                R.drawable.list_yellow_single,  // 黄色单一背景
+                R.drawable.list_blue_single,    // 蓝色单一背景
+                R.drawable.list_white_single,   // 白色单一背景
+                R.drawable.list_green_single,   // 绿色单一背景
+                R.drawable.list_red_single      // 红色单一背景
+        };
+
+        // 根据id获取第一部分背景资源的ID
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+
+        // 根据id获取最后一部分背景资源的ID
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+
+        // 根据id获取单一背景资源的ID
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+
+        // 根据id获取中间部分背景资源的ID
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+
+        // 获取文件夹背景资源的ID
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;  // 文件夹背景
+        }
+    }
+
+    public static class WidgetBgResources {
+        // 定义一个静态数组，存储2倍分辨率的背景资源ID
+        private final static int [] BG_2X_RESOURCES = new int [] {
+                R.drawable.widget_2x_yellow,  // 2倍分辨率黄色背景资源
+                R.drawable.widget_2x_blue,    // 2倍分辨率蓝色背景资源
+                R.drawable.widget_2x_white,   // 2倍分辨率白色背景资源
+                R.drawable.widget_2x_green,   // 2倍分辨率绿色背景资源
+                R.drawable.widget_2x_red      // 2倍分辨率红色背景资源
+        };
+
+        /**
+         * 根据传入的id获取2倍分辨率背景资源ID
+         * @param id 背景资源在BG_2X_RESOURCES数组中的索引
+         * @return 对应索引的背景资源ID
+         */
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+
+        // 定义一个静态数组，存储4倍分辨率的背景资源ID
+        private final static int [] BG_4X_RESOURCES = new int [] {
+                R.drawable.widget_4x_yellow,  // 4倍分辨率黄色背景资源
+                R.drawable.widget_4x_blue,    // 4倍分辨率蓝色背景资源
+                R.drawable.widget_4x_white,   // 4倍分辨率白色背景资源
+                R.drawable.widget_4x_green,   // 4倍分辨率绿色背景资源
+                R.drawable.widget_4x_red      // 4倍分辨率红色背景资源
+        };
+
+        /**
+         * 根据传入的id获取4倍分辨率背景资源ID
+         * @param id 背景资源在BG_4X_RESOURCES数组中的索引
+         * @return 对应索引的背景资源ID
+         */
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+
+    public static class TextAppearanceResources {
+        // 定义一个静态数组，存储不同的文本外观资源ID
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+                R.style.TextAppearanceNormal,   // 正常文本外观样式
+                R.style.TextAppearanceMedium,   // 中等文本外观样式
+                R.style.TextAppearanceLarge,    // 大文本外观样式
+                R.style.TextAppearanceSuper     // 超大文本外观样式
+        };
+
+        /**
+         * 根据传入的ID获取对应的文本外观资源ID
+         * @param id 用于索引资源数组的ID值
+         * @return 如果ID有效则返回对应的资源ID，否则返回默认背景字体大小
+         *
+         * HACKME: 修复存储在SharedPreferences中的资源ID的bug。
+         * 当ID超出数组长度时，返回默认背景字体大小{@link ResourceParser#BG_DEFAULT_FONT_SIZE}
+         */
+        public static int getTexAppearanceResource(int id) {
+            if (id >= TEXTAPPEARANCE_RESOURCES.length) {
+                return BG_DEFAULT_FONT_SIZE; // 返回默认背景字体大小
+            }
+            return TEXTAPPEARANCE_RESOURCES[id]; // 返回对应索引的资源ID
+        }
+
+        /**
+         * 获取文本外观资源数组的总大小
+         * @return 文本外观资源数组的长度
+         */
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length; // 返回资源数组的长度
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/AlarmAlertActivity.java

@@ -0,0 +1,224 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui; // 定义包名
+
+// 导入必要的类和接口
+import android.app.Activity; // Android Activity类，用于管理Activity生命周期
+import android.app.AlertDialog; // Android AlertDialog类，用于显示对话框
+import android.content.Context; // Android Context类，提供应用环境信息
+import android.content.DialogInterface; // Android DialogInterface类，处理对话框事件
+import android.content.Intent; // Android Intent类，用于在组件间传递消息
+import android.media.AudioManager; // Android AudioManager类，管理音频相关设置
+import android.media.MediaPlayer; // Android MediaPlayer类，用于播放媒体文件
+import android.media.RingtoneManager; // Android RingtoneManager类，管理设备铃声
+import android.net.Uri; // Android Uri类，表示统一资源标识符
+import android.os.Bundle; // Android Bundle类，用于保存和传递数据
+import android.os.PowerManager; // Android PowerManager类，管理电源状态
+import android.provider.Settings; // Android Settings类，访问系统设置
+import android.view.Window; // Android Window类，管理窗口属性
+import android.view.WindowManager; // Android WindowManager类，管理窗口布局
+
+import net.micode.xiaomi_note.R; // 引入当前项目的资源文件
+import net.micode.xiaomi_note.data.Notes; // 引入项目中的Notes类
+import net.micode.xiaomi_note.tool.DataUtils; // 引入项目中的DataUtils工具类
+
+import java.io.IOException; // Java标准库中的IOException类，处理输入输出异常
+
+
+// 定义一个继承自Activity的类AlarmAlertActivity，并实现OnClickListener和OnDismissListener接口
+public class AlarmAlertActivity extends Activity implements
+        DialogInterface.OnClickListener, DialogInterface.OnDismissListener {
+
+    // 声明一个长整型变量mNoteId，用于存储闹钟笔记ID
+    private long mNoteId;
+
+    // 声明一个字符串变量mSnippet，用于存储闹钟的简短描述信息
+    private String mSnippet;
+
+    // 定义一个静态常量SNIPPET_PREW_MAX_LEN，表示简短描述信息的最大长度（60字符）
+    private static final int SNIPPET_PREW_MAX_LEN = 60;
+
+    // 声明一个MediaPlayer对象mPlayer，用于播放闹钟声音
+    MediaPlayer mPlayer;
+
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        // 调用父类方法，初始化活动
+        super.onCreate(savedInstanceState);
+
+        // 隐藏标题栏
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+
+        // 获取窗口对象并设置标志位，使应用在锁屏时也能显示
+        final Window win = getWindow();
+        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
+
+        // 判断屏幕是否处于点亮状态，若未点亮则设置相关标志位
+        if (!isScreenOn()) {
+            win.addFlags(
+                    WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON // 保持屏幕常亮
+                            | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON // 打开屏幕
+                            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON // 允许在屏幕常亮时锁定设备
+                            | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR); // 设置布局适应装饰区域
+        }
+
+        // 获取传递给当前活动的意图
+        Intent intent = getIntent();
+
+        try {
+            // 从意图中提取笔记ID，并将其转换为长整型
+            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
+
+            // 根据笔记ID查询笔记摘要信息
+            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
+
+            // 如果摘要长度超过预设最大值，则截取并追加提示字符串
+            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ?
+                    mSnippet.substring(0, SNIPPET_PREW_MAX_LEN) +
+                            getResources().getString(R.string.notelist_string_info) :
+                    mSnippet;
+        } catch (IllegalArgumentException e) {
+            // 捕获非法参数异常并打印堆栈信息，直接退出方法
+            e.printStackTrace();
+            return;
+        }
+
+        // 初始化MediaPlayer对象
+        mPlayer = new MediaPlayer();
+
+        // 判断指定类型的笔记是否可见，若可见则执行后续操作
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
+            showActionDialog(); // 显示操作对话框
+            playAlarmSound();   // 播放警报声音
+        } else {
+            finish(); // 否则关闭当前活动
+        }
+    }
+
+    // 判断屏幕是否处于开启状态的方法
+    private boolean isScreenOn() {
+        // 获取系统服务中的电源管理器
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        // 调用电源管理器的isScreenOn方法，判断屏幕是否开启
+        return pm.isScreenOn();
+    }
+
+    private void playAlarmSound() {
+        // 获取系统默认的闹钟声音URI
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
+
+        // 获取系统设置中影响铃声流的掩码值，默认值为0
+        int silentModeStreams = Settings.System.getInt(getContentResolver(),
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+
+        // 判断当前是否处于静音模式下，且静音模式是否影响闹钟声音流
+        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
+            // 如果受影响，则设置播放器使用静音模式指定的音频流类型
+            mPlayer.setAudioStreamType(silentModeStreams);
+        } else {
+            // 否则使用默认的闹钟音频流类型
+            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
+        }
+
+        try {
+            // 设置播放器的数据源为指定的闹钟声音URI
+            mPlayer.setDataSource(this, url);
+            // 准备播放器以播放音频
+            mPlayer.prepare();
+            // 设置播放器循环播放
+            mPlayer.setLooping(true);
+            // 开始播放音频
+            mPlayer.start();
+        } catch (IllegalArgumentException e) {
+            // 捕获非法参数异常并打印堆栈信息
+            e.printStackTrace();
+        } catch (SecurityException e) {
+            // 捕获安全异常并打印堆栈信息
+            e.printStackTrace();
+        } catch (IllegalStateException e) {
+            // 捕获非法状态异常并打印堆栈信息
+            e.printStackTrace();
+        } catch (IOException e) {
+            // 捕获输入输出异常并打印堆栈信息
+            e.printStackTrace();
+        }
+    }
+    private void showActionDialog() {
+        // 创建一个AlertDialog的构建器实例
+        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+
+        // 设置对话框的标题，R.string.app_name是一个字符串资源的引用
+        dialog.setTitle(R.string.app_name);
+
+        // 设置对话框的消息内容，mSnippet是当前类的一个成员变量
+        dialog.setMessage(mSnippet);
+
+        // 设置对话框的“确定”按钮，R.string.notealert_ok是按钮文本的资源引用，并设置点击事件监听器为当前类
+        dialog.setPositiveButton(R.string.notealert_ok, this);
+
+        // 判断设备屏幕是否处于开启状态
+        if (isScreenOn()) {
+            // 如果屏幕开启，则设置“进入”按钮，R.string.notealert_enter是按钮文本的资源引用，并设置点击事件监听器为当前类
+            dialog.setNegativeButton(R.string.notealert_enter, this);
+        }
+
+        // 显示对话框，并为对话框设置 dismiss 事件的监听器
+        dialog.show().setOnDismissListener(this);
+    }
+
+    public void onClick(DialogInterface dialog, int which) {
+        // 根据用户点击的按钮进行不同的处理
+        switch (which) {
+            // 如果点击的是负向按钮（通常是“取消”）
+            case DialogInterface.BUTTON_NEGATIVE:
+                // 创建一个新的Intent对象，用于启动NoteEditActivity
+                Intent intent = new Intent(this, NoteEditActivity.class);
+                // 设置Intent的动作为ACTION_VIEW，表示查看数据
+                intent.setAction(Intent.ACTION_VIEW);
+                // 添加额外的数据到Intent中，这里传递了一个UID用于标识笔记
+                intent.putExtra(Intent.EXTRA_UID, mNoteId);
+                // 启动目标Activity
+                startActivity(intent);
+                break;
+            default:
+                // 其他情况不做任何处理
+                break;
+        }
+    }
+
+    // 当对话框被dismiss时触发的方法
+    public void onDismiss(DialogInterface dialog) {
+        // 停止闹钟声音的播放
+        stopAlarmSound();
+        // 结束当前Activity
+        finish();
+    }
+
+    // 停止闹钟声音的私有方法
+    private void stopAlarmSound() {
+        // 如果mPlayer对象不为空
+        if (mPlayer != null) {
+            // 停止播放声音
+            mPlayer.stop();
+            // 释放MediaPlayer资源
+            mPlayer.release();
+            // 将mPlayer置为null，避免后续空指针异常
+            mPlayer = null;
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/AlarmInitReceiver.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+
+// 定义一个广播接收器类用于初始化闹钟
+public class AlarmInitReceiver extends BroadcastReceiver {
+
+    // 定义查询时需要的列名数组
+    private static final String [] PROJECTION = new String [] {
+            NoteColumns.ID,          // 笔记ID
+            NoteColumns.ALERTED_DATE // 闹钟触发日期
+    };
+
+    // 定义查询结果中列的位置常量
+    private static final int COLUMN_ID                = 0;   // 笔记ID所在列的位置
+    private static final int COLUMN_ALERTED_DATE      = 1;   // 闹钟触发日期所在列的位置
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // 获取当前系统时间
+        long currentDate = System.currentTimeMillis();
+
+        // 查询数据库中未触发的闹钟记录
+        Cursor c = context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                PROJECTION,
+                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE,
+                new String[] { String.valueOf(currentDate) }, // 设置查询条件：闹钟触发日期大于当前时间且类型为笔记
+                null); // 不指定排序方式
+
+        // 如果查询结果不为空
+        if (c != null) {
+            // 如果有数据可读取
+            if (c.moveToFirst()) {
+                do {
+                    // 获取当前记录的闹钟触发日期
+                    long alertDate = c.getLong(COLUMN_ALERTED_DATE);
+
+                    // 创建发送给闹钟接收器的意图
+                    Intent sender = new Intent(context, AlarmReceiver.class);
+                    // 为意图设置数据，包含笔记ID
+                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));
+
+                    // 获取PendingIntent对象，用于触发闹钟
+                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender,
+                            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
+
+                    // 获取系统闹钟管理服务
+                    AlarmManager alermManager = (AlarmManager) context
+                            .getSystemService(Context.ALARM_SERVICE);
+
+                    // 设置闹钟在指定时间触发
+                    alermManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
+                } while (c.moveToNext()); // 遍历所有符合条件的记录
+            }
+            // 关闭游标释放资源
+            c.close();
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/AlarmReceiver.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui;
+
+// 导入BroadcastReceiver类，用于接收广播事件
+import android.content.BroadcastReceiver;
+// 导入Context类，提供应用程序的全局信息
+import android.content.Context;
+// 导入Intent类，用于在不同组件之间传递消息
+import android.content.Intent;
+
+// 定义一个继承自BroadcastReceiver的类，用于处理闹钟相关的广播事件
+public class AlarmReceiver extends BroadcastReceiver {
+
+    // 重写onReceive方法，当接收到广播时会被调用
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        // 设置目标Activity为AlarmAlertActivity
+        intent.setClass(context, AlarmAlertActivity.class);
+        // 添加启动标志，确保新任务被创建
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        // 启动指定的Activity
+        context.startActivity(intent);
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/DateTimePicker.java

@@ -0,0 +1,590 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package net.micode.xiaomi_note.ui; // 定义包名，表示该文件属于此包
+
+// 导入必要的类库，包括日期格式符号、日历等工具类
+import java.text.DateFormatSymbols;
+import java.util.Calendar;
+
+// 引入资源文件，用于获取应用中的字符串和其他资源
+import net.micode.xiaomi_note.R;
+
+// 导入Android相关类，用于UI组件和上下文操作
+import android.content.Context;
+import android.text.format.DateFormat;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.NumberPicker;
+
+public class DateTimePicker extends FrameLayout {
+
+    // 默认启用状态
+    private static final boolean DEFAULT_ENABLE_STATE = true;
+
+    // 半天中的小时数
+    private static final int HOURS_IN_HALF_DAY = 12;
+    // 一天中的小时数
+    private static final int HOURS_IN_ALL_DAY = 24;
+    // 一周中的天数
+    private static final int DAYS_IN_ALL_WEEK = 7;
+    // 日期选择器的最小值
+    private static final int DATE_SPINNER_MIN_VAL = 0;
+    // 日期选择器的最大值（基于一周的天数）
+    private static final int DATE_SPINNER_MAX_VAL = DAYS_IN_ALL_WEEK - 1;
+    // 24小时制下小时选择器的最小值
+    private static final int HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW = 0;
+    // 24小时制下小时选择器的最大值
+    private static final int HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW = 23;
+    // 12小时制下小时选择器的最小值
+    private static final int HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW = 1;
+    // 12小时制下小时选择器的最大值
+    private static final int HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW = 12;
+    // 分钟选择器的最小值
+    private static final int MINUT_SPINNER_MIN_VAL = 0;
+    // 分钟选择器的最大值
+    private static final int MINUT_SPINNER_MAX_VAL = 59;
+    // AM/PM选择器的最小值
+    private static final int AMPM_SPINNER_MIN_VAL = 0;
+    // AM/PM选择器的最大值
+    private static final int AMPM_SPINNER_MAX_VAL = 1;
+
+    // 日期选择器
+    private final NumberPicker mDateSpinner;
+    // 小时选择器
+    private final NumberPicker mHourSpinner;
+    // 分钟选择器
+    private final NumberPicker mMinuteSpinner;
+    // AM/PM选择器
+    private final NumberPicker mAmPmSpinner;
+    // 当前日期时间
+    private Calendar mDate;
+
+    // 日期显示值数组
+    private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
+
+    // 是否为上午
+    private boolean mIsAm;
+
+    // 是否为24小时制
+    private boolean mIs24HourView;
+
+    // 是否启用
+    private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
+
+    // 初始化标志
+    private boolean mInitialising;
+
+    // 日期时间改变监听器
+    private OnDateTimeChangedListener mOnDateTimeChangedListener;
+
+
+    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 调整日期选择器的日期值
+            mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
+            // 更新日期控件显示
+            updateDateControl();
+            // 触发日期时间变化事件
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            boolean isDateChanged = false; // 标记是否需要更新日期
+            Calendar cal = Calendar.getInstance(); // 获取当前时间的Calendar实例
+
+            if (!mIs24HourView) { // 如果是AM/PM模式
+                if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
+                    // 从下午切换到上午
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1); // 增加一天
+                    isDateChanged = true;
+                } else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    // 从上午切换到下午
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1); // 减少一天
+                    isDateChanged = true;
+                }
+                if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
+                        oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
+                    // AM/PM切换时更新AM/PM状态
+                    mIsAm = !mIsAm;
+                    updateAmPmControl();
+                }
+            } else { // 如果是24小时制
+                if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
+                    // 从23点切换到0点
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, 1); // 增加一天
+                    isDateChanged = true;
+                } else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
+                    // 从0点切换到23点
+                    cal.setTimeInMillis(mDate.getTimeInMillis());
+                    cal.add(Calendar.DAY_OF_YEAR, -1); // 减少一天
+                    isDateChanged = true;
+                }
+            }
+            // 计算新的小时值
+            int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
+            mDate.set(Calendar.HOUR_OF_DAY, newHour);
+            // 触发日期时间变化事件
+            onDateTimeChanged();
+            if (isDateChanged) {
+                // 如果日期发生变化，更新年、月、日显示
+                setCurrentYear(cal.get(Calendar.YEAR));
+                setCurrentMonth(cal.get(Calendar.MONTH));
+                setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
+            }
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 获取分钟选择器的最小值
+            int minValue = mMinuteSpinner.getMinValue();
+            // 获取分钟选择器的最大值
+            int maxValue = mMinuteSpinner.getMaxValue();
+            // 初始化偏移量为0
+            int offset = 0;
+
+            // 如果旧值是最大值且新值是最小值，则表示跨过了一天的边界，增加一天
+            if (oldVal == maxValue && newVal == minValue) {
+                offset += 1;
+            }
+            // 如果旧值是最小值且新值是最大值，则表示跨过了前一天的边界，减少一天
+            else if (oldVal == minValue && newVal == maxValue) {
+                offset -= 1;
+            }
+
+            // 如果有跨天偏移，则调整日期时间控件
+            if (offset != 0) {
+                // 调整日期时间对象的小时数
+                mDate.add(Calendar.HOUR_OF_DAY, offset);
+                // 更新小时选择器的值
+                mHourSpinner.setValue(getCurrentHour());
+                // 更新日期控件显示
+                updateDateControl();
+                // 获取当前小时
+                int newHour = getCurrentHourOfDay();
+                // 判断是否进入下午时段
+                if (newHour >= HOURS_IN_HALF_DAY) {
+                    mIsAm = false;
+                    // 更新AM/PM控件
+                    updateAmPmControl();
+                }
+                // 否则仍在上午时段
+                else {
+                    mIsAm = true;
+                    // 更新AM/PM控件
+                    updateAmPmControl();
+                }
+            }
+
+            // 设置新的分钟值到日期时间对象
+            mDate.set(Calendar.MINUTE, newVal);
+            // 触发日期时间改变事件
+            onDateTimeChanged();
+        }
+    };
+
+    private NumberPicker.OnValueChangeListener mOnAmPmChangedListener = new NumberPicker.OnValueChangeListener() {
+        @Override
+        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
+            // 切换 AM/PM 状态
+            mIsAm = !mIsAm;
+
+            // 根据当前是 AM 还是 PM 调整日期时间
+            if (mIsAm) {
+                // 如果切换到 AM，则减少 12 小时（半天）
+                mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
+            } else {
+                // 如果切换到 PM，则增加 12 小时（半天）
+                mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
+            }
+
+            // 更新 AM/PM 控件的状态显示
+            updateAmPmControl();
+
+            // 触发日期时间改变事件
+            onDateTimeChanged();
+        }
+    };
+
+    public interface OnDateTimeChangedListener {
+        // 定义一个接口方法，用于监听日期时间变化事件
+        void onDateTimeChanged(DateTimePicker view, int year, int month,
+                               int dayOfMonth, int hourOfDay, int minute);
+    }
+
+    public DateTimePicker(Context context) {
+        // 构造函数，使用默认时间（当前系统时间）初始化
+        this(context, System.currentTimeMillis());
+    }
+
+    public DateTimePicker(Context context, long date) {
+        // 构造函数，使用指定时间初始化，并启用24小时制判断
+        this(context, date, DateFormat.is24HourFormat(context));
+    }
+
+    public DateTimePicker(Context context, long date, boolean is24HourView) {
+        super(context);
+        // 初始化成员变量
+        mDate = Calendar.getInstance();
+        mInitialising = true;
+        mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
+
+        // 加载布局文件
+        inflate(context, R.layout.datetime_picker, this);
+
+        // 初始化日期选择器
+        mDateSpinner = (NumberPicker) findViewById(R.id.date);
+        mDateSpinner.setMinValue(DATE_SPINNER_MIN_VAL);
+        mDateSpinner.setMaxValue(DATE_SPINNER_MAX_VAL);
+        mDateSpinner.setOnValueChangedListener(mOnDateChangedListener);
+
+        // 初始化小时选择器
+        mHourSpinner = (NumberPicker) findViewById(R.id.hour);
+        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);
+
+        // 初始化分钟选择器
+        mMinuteSpinner = (NumberPicker) findViewById(R.id.minute);
+        mMinuteSpinner.setMinValue(MINUT_SPINNER_MIN_VAL);
+        mMinuteSpinner.setMaxValue(MINUT_SPINNER_MAX_VAL);
+        mMinuteSpinner.setOnLongPressUpdateInterval(100);
+        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);
+
+        // 初始化上午/下午选择器
+        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings();
+        mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
+        mAmPmSpinner.setMinValue(AMPM_SPINNER_MIN_VAL);
+        mAmPmSpinner.setMaxValue(AMPM_SPINNER_MAX_VAL);
+        mAmPmSpinner.setDisplayedValues(stringsForAmPm);
+        mAmPmSpinner.setOnValueChangedListener(mOnAmPmChangedListener);
+
+        // 更新控件到初始状态
+        updateDateControl();
+        updateHourControl();
+        updateAmPmControl();
+
+        // 设置24小时制模式
+        set24HourView(is24HourView);
+
+        // 设置当前日期
+        setCurrentDate(date);
+
+        // 设置是否可用
+        setEnabled(isEnabled());
+
+        // 设置内容描述
+        mInitialising = false;
+    }
+    @Override
+    public void setEnabled(boolean enabled) {
+        // 如果当前状态与设置的状态相同，则直接返回
+        if (mIsEnabled == enabled) {
+            return;
+        }
+        // 调用父类方法设置控件启用状态
+        super.setEnabled(enabled);
+        // 分别设置子控件的启用状态
+        mDateSpinner.setEnabled(enabled);
+        mMinuteSpinner.setEnabled(enabled);
+        mHourSpinner.setEnabled(enabled);
+        mAmPmSpinner.setEnabled(enabled);
+        // 更新内部状态变量
+        mIsEnabled = enabled;
+    }
+
+    @Override
+    public boolean isEnabled() {
+        // 返回当前控件的启用状态
+        return mIsEnabled;
+    }
+
+    /**
+     * Get the current date in millis
+     *
+     * @return the current date in millis
+     */
+    public long getCurrentDateInTimeMillis() {
+        // 获取当前日期的时间戳（毫秒）
+        return mDate.getTimeInMillis();
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param date The current date in millis
+     */
+    public void setCurrentDate(long date) {
+        // 创建一个新的Calendar实例，并设置其时间为给定的时间戳
+        Calendar cal = Calendar.getInstance();
+        cal.setTimeInMillis(date);
+        // 调用多参数setCurrentDate方法设置具体日期时间
+        setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
+                cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
+    }
+
+    /**
+     * Set the current date
+     *
+     * @param year The current year
+     * @param month The current month
+     * @param dayOfMonth The current dayOfMonth
+     * @param hourOfDay The current hourOfDay
+     * @param minute The current minute
+     */
+    public void setCurrentDate(int year, int month,
+                               int dayOfMonth, int hourOfDay, int minute) {
+        // 设置年、月、日、小时、分钟
+        setCurrentYear(year);
+        setCurrentMonth(month);
+        setCurrentDay(dayOfMonth);
+        setCurrentHour(hourOfDay);
+        setCurrentMinute(minute);
+    }
+
+    /**
+     * Get current year
+     *
+     * @return The current year
+     */
+    public int getCurrentYear() {
+        // 获取当前年份
+        return mDate.get(Calendar.YEAR);
+    }
+
+    /**
+     * Set current year
+     *
+     * @param year The current year
+     */
+    public void setCurrentYear(int year) {
+        // 如果正在初始化且年份未变化，则直接返回
+        if (!mInitialising && year == getCurrentYear()) {
+            return;
+        }
+        // 设置新的年份
+        mDate.set(Calendar.YEAR, year);
+        // 更新日期控件显示
+        updateDateControl();
+        // 触发日期改变事件
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current month in the year
+     *
+     * @return The current month in the year
+     */
+    public int getCurrentMonth() {
+        // 获取当前月份
+        return mDate.get(Calendar.MONTH);
+    }
+
+    /**
+     * Set current month in the year
+     *
+     * @param month The month in the year
+     */
+    public void setCurrentMonth(int month) {
+        // 如果正在初始化且月份未变化，则直接返回
+        if (!mInitialising && month == getCurrentMonth()) {
+            return;
+        }
+        // 设置新的月份
+        mDate.set(Calendar.MONTH, month);
+        // 更新日期控件显示
+        updateDateControl();
+        // 触发日期改变事件
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current day of the month
+     *
+     * @return The day of the month
+     */
+    public int getCurrentDay() {
+        // 获取当前日期在当月中的天数
+        return mDate.get(Calendar.DAY_OF_MONTH);
+    }
+
+    /**
+     * Set current day of the month
+     *
+     * @param dayOfMonth The day of the month
+     */
+    public void setCurrentDay(int dayOfMonth) {
+        // 如果正在初始化且天数未变化，则直接返回
+        if (!mInitialising && dayOfMonth == getCurrentDay()) {
+            return;
+        }
+        // 设置新的日期
+        mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+        // 更新日期控件显示
+        updateDateControl();
+        // 触发日期改变事件
+        onDateTimeChanged();
+    }
+
+    /**
+     * Get current hour in 24 hour mode, in the range (0~23)
+     * @return The current hour in 24 hour mode
+     */
+    public int getCurrentHourOfDay() {
+        return mDate.get(Calendar.HOUR_OF_DAY); // 获取当前时间的24小时制小时数
+    }
+
+    private int getCurrentHour() {
+        if (mIs24HourView){ // 如果是24小时制模式
+            return getCurrentHourOfDay(); // 直接返回24小时制的小时数
+        } else { // 如果是AM/PM模式
+            int hour = getCurrentHourOfDay(); // 获取24小时制的小时数
+            if (hour > HOURS_IN_HALF_DAY) { // 如果超过中午12点
+                return hour - HOURS_IN_HALF_DAY; // 转换为12小时制的下午小时数
+            } else {
+                return hour == 0 ? HOURS_IN_HALF_DAY : hour; // 如果是凌晨0点，显示为12点；否则直接返回
+            }
+        }
+    }
+
+    /**
+     * Set current hour in 24 hour mode, in the range (0~23)
+     *
+     * @param hourOfDay
+     */
+    public void setCurrentHour(int hourOfDay) {
+        if (!mInitialising && hourOfDay == getCurrentHourOfDay()) { // 如果不是初始化状态且输入值未改变
+            return; // 不做任何操作
+        }
+        mDate.set(Calendar.HOUR_OF_DAY, hourOfDay); // 设置当前时间为指定的24小时制小时数
+        if (!mIs24HourView) { // 如果是AM/PM模式
+            if (hourOfDay >= HOURS_IN_HALF_DAY) { // 如果是下午或晚上
+                mIsAm = false; // 设置为PM模式
+                if (hourOfDay > HOURS_IN_HALF_DAY) { // 如果超过下午6点
+                    hourOfDay -= HOURS_IN_HALF_DAY; // 调整为12小时制的下午小时数
+                }
+            } else { // 如果是上午
+                mIsAm = true; // 设置为AM模式
+                if (hourOfDay == 0) { // 如果是凌晨0点
+                    hourOfDay = HOURS_IN_HALF_DAY; // 显示为12点
+                }
+            }
+            updateAmPmControl(); // 更新AM/PM控件的状态
+        }
+        mHourSpinner.setValue(hourOfDay); // 更新小时选择器的值
+        onDateTimeChanged(); // 触发日期时间变化回调
+    }
+
+    /**
+     * Get currentMinute
+     *
+     * @return The Current Minute
+     */
+    public int getCurrentMinute() {
+        return mDate.get(Calendar.MINUTE); // 获取当前分钟数
+    }
+
+    /**
+     * Set current minute
+     */
+    public void setCurrentMinute(int minute) {
+        if (!mInitialising && minute == getCurrentMinute()) { // 如果不是初始化状态且输入值未改变
+            return; // 不做任何操作
+        }
+        mMinuteSpinner.setValue(minute); // 更新分钟选择器的值
+        mDate.set(Calendar.MINUTE, minute); // 设置当前时间为指定的分钟数
+        onDateTimeChanged(); // 触发日期时间变化回调
+    }
+
+    /**
+     * @return true if this is in 24 hour view else false.
+     */
+    public boolean is24HourView () {
+        return mIs24HourView; // 返回是否处于24小时制模式
+    }
+
+    /**
+     * Set whether in 24 hour or AM/PM mode.
+     *
+     * @param is24HourView True for 24 hour mode. False for AM/PM mode.
+     */
+    public void set24HourView(boolean is24HourView) {
+        if (mIs24HourView == is24HourView) { // 如果模式未发生变化
+            return; // 不做任何操作
+        }
+        mIs24HourView = is24HourView; // 更新模式标志
+        mAmPmSpinner.setVisibility(is24HourView ? View.GONE : View.VISIBLE); // 隐藏或显示AM/PM选择器
+        int hour = getCurrentHourOfDay(); // 获取当前24小时制的小时数
+        updateHourControl(); // 更新小时选择器的范围
+        setCurrentHour(hour); // 设置当前小时数
+        updateAmPmControl(); // 更新AM/PM控件的状态
+    }
+
+    private void updateDateControl() {
+        Calendar cal = Calendar.getInstance(); // 创建一个Calendar实例
+        cal.setTimeInMillis(mDate.getTimeInMillis()); // 初始化为当前日期时间
+        cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1); // 计算基准日期
+        mDateSpinner.setDisplayedValues(null); // 清空日期选择器的显示值
+        for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) { // 循环填充一周的日期
+            cal.add(Calendar.DAY_OF_YEAR, 1); // 每次增加一天
+            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal); // 格式化日期为"月.日 星期X"
+        }
+        mDateSpinner.setDisplayedValues(mDateDisplayValues); // 设置日期选择器的显示值
+        mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2); // 设置默认选中值为中心日期
+        mDateSpinner.invalidate(); // 请求重新绘制
+    }
+
+    private void updateAmPmControl() {
+        if (mIs24HourView) { // 如果是24小时制模式
+            mAmPmSpinner.setVisibility(View.GONE); // 隐藏AM/PM选择器
+        } else { // 如果是AM/PM模式
+            int index = mIsAm ? Calendar.AM : Calendar.PM; // 判断当前是AM还是PM
+            mAmPmSpinner.setValue(index); // 设置AM/PM选择器的值
+            mAmPmSpinner.setVisibility(View.VISIBLE); // 显示AM/PM选择器
+        }
+    }
+
+    private void updateHourControl() {
+        if (mIs24HourView) { // 如果是24小时制模式
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_24_HOUR_VIEW); // 设置最小值为24小时制的最小值
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_24_HOUR_VIEW); // 设置最大值为24小时制的最大值
+        } else { // 如果是AM/PM模式
+            mHourSpinner.setMinValue(HOUR_SPINNER_MIN_VAL_12_HOUR_VIEW); // 设置最小值为12小时制的最小值
+            mHourSpinner.setMaxValue(HOUR_SPINNER_MAX_VAL_12_HOUR_VIEW); // 设置最大值为12小时制的最大值
+        }
+    }
+
+    /**
+     * Set the callback that indicates the 'Set' button has been pressed.
+     * @param callback the callback, if null will do nothing
+     */
+    public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
+        mOnDateTimeChangedListener = callback; // 设置日期时间变化的回调监听器
+    }
+
+    private void onDateTimeChanged() {
+        if (mOnDateTimeChangedListener != null) { // 如果存在回调监听器
+            mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(), // 触发回调，传递当前年、月、日、小时、分钟等信息
+                    getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/DateTimePickerDialog.java

@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui; // 定义包名
+
+// 导入所需的Java类库
+import java.util.Calendar; // 导入日历类，用于日期和时间操作
+
+// 导入项目内部资源和自定义类
+import net.micode.xiaomi_note.R; // 导入资源文件
+import net.micode.xiaomi_note.ui.DateTimePicker; // 导入日期时间选择器类
+import net.micode.xiaomi_note.ui.DateTimePicker.OnDateTimeChangedListener; // 导入日期时间改变监听接口
+
+// 导入Android系统类库
+import android.app.AlertDialog; // 导入对话框类
+import android.content.Context; // 导入上下文类
+import android.content.DialogInterface; // 导入对话框事件监听接口
+import android.content.DialogInterface.OnClickListener; // 导入对话框按钮点击事件监听器接口
+import android.text.format.DateFormat; // 导入日期格式化工具类
+import android.text.format.DateUtils; // 导入日期工具类
+
+// 定义一个继承自AlertDialog的对话框类，用于日期时间选择
+public class DateTimePickerDialog extends AlertDialog implements OnClickListener {
+
+    // 当前选择的日期时间
+    private Calendar mDate = Calendar.getInstance();
+
+    // 是否使用24小时制
+    private boolean mIs24HourView;
+
+    // 日期时间设置监听器
+    private OnDateTimeSetListener mOnDateTimeSetListener;
+
+    // 日期时间选择器控件
+    private DateTimePicker mDateTimePicker;
+
+    // 定义日期时间设置监听器接口
+    public interface OnDateTimeSetListener {
+        void OnDateTimeSet(AlertDialog dialog, long date); // 回调方法，通知日期时间已设置
+    }
+
+    // 构造函数，初始化日期时间选择对话框
+    public DateTimePickerDialog(Context context, long date) {
+        super(context);
+
+        // 初始化日期时间选择器
+        mDateTimePicker = new DateTimePicker(context);
+        setView(mDateTimePicker); // 将日期时间选择器设置为对话框的内容视图
+
+        // 设置日期时间变化监听器
+        mDateTimePicker.setOnDateTimeChangedListener(new OnDateTimeChangedListener() {
+            public void onDateTimeChanged(DateTimePicker view, int year, int month,
+                                          int dayOfMonth, int hourOfDay, int minute) {
+                // 更新内部存储的日期时间
+                mDate.set(Calendar.YEAR, year);
+                mDate.set(Calendar.MONTH, month);
+                mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
+                mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
+                mDate.set(Calendar.MINUTE, minute);
+                updateTitle(mDate.getTimeInMillis()); // 更新对话框标题
+            }
+        });
+
+        // 初始化日期时间为传入的时间戳，并设置秒数为0
+        mDate.setTimeInMillis(date);
+        mDate.set(Calendar.SECOND, 0);
+        mDateTimePicker.setCurrentDate(mDate.getTimeInMillis()); // 设置初始日期时间到选择器
+
+        // 设置确定按钮和取消按钮
+        setButton(context.getString(R.string.datetime_dialog_ok), this); // 确定按钮绑定点击事件
+        setButton2(context.getString(R.string.datetime_dialog_cancel), (OnClickListener)null); // 取消按钮无操作
+
+        // 根据系统设置判断是否使用24小时制
+        set24HourView(DateFormat.is24HourFormat(this.getContext()));
+
+        // 初始化对话框标题
+        updateTitle(mDate.getTimeInMillis());
+    }
+
+    // 设置是否使用24小时制
+    public void set24HourView(boolean is24HourView) {
+        mIs24HourView = is24HourView;
+    }
+
+    // 设置日期时间设置监听器
+    public void setOnDateTimeSetListener(OnDateTimeSetListener callBack) {
+        mOnDateTimeSetListener = callBack;
+    }
+
+    // 更新对话框标题的方法
+    private void updateTitle(long date) {
+        // 定义日期时间显示格式标志位
+        int flag =
+                DateUtils.FORMAT_SHOW_YEAR |
+                        DateUtils.FORMAT_SHOW_DATE |
+                        DateUtils.FORMAT_SHOW_TIME;
+        flag |= mIs24HourView ? DateUtils.FORMAT_24HOUR : DateUtils.FORMAT_12HOUR; // 根据24小时制设置格式
+
+        // 使用DateUtils格式化日期时间并设置为对话框标题
+        setTitle(DateUtils.formatDateTime(this.getContext(), date, flag));
+    }
+
+    // 处理对话框按钮点击事件
+    public void onClick(DialogInterface arg0, int arg1) {
+        if (mOnDateTimeSetListener != null) {
+            // 调用监听器回调方法，通知日期时间已设置
+            mOnDateTimeSetListener.OnDateTimeSet(this, mDate.getTimeInMillis());
+        }
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/DropdownMenu.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// DropdownMenu.java文件，定义了一个下拉菜单相关的类
+package net.micode.xiaomi_note.ui; // 定义包名，用于组织相关类
+
+// 导入必要的Android框架类
+import android.content.Context; // 提供应用环境信息的上下文类
+import android.view.Menu; // 用于表示菜单的数据结构
+import android.view.MenuItem; // 表示菜单中的具体选项
+import android.view.View; // 基础视图类，所有UI组件的基类
+import android.view.View.OnClickListener; // 视图点击监听器接口
+import android.widget.Button; // 按钮控件类
+import android.widget.PopupMenu; // 弹出式菜单类
+import android.widget.PopupMenu.OnMenuItemClickListener; // 弹出菜单项点击事件监听器接口
+
+// 导入自定义资源文件
+import net.micode.xiaomi_note.R; // 引入R类，用于访问资源文件
+
+// DropdownMenu类用于创建一个带有下拉菜单的功能按钮
+public class DropdownMenu {
+    // 按钮对象，用于触发下拉菜单
+    private Button mButton;
+    // 弹出式菜单对象，用于显示下拉菜单
+    private PopupMenu mPopupMenu;
+    // 菜单对象，存储具体的菜单项
+    private Menu mMenu;
+
+    // 构造函数，初始化DropdownMenu对象
+    public DropdownMenu(Context context, Button button, int menuId) {
+        mButton = button; // 初始化按钮
+        mButton.setBackgroundResource(R.drawable.dropdown_icon); // 设置按钮背景图标
+        mPopupMenu = new PopupMenu(context, mButton); // 创建弹出式菜单
+        mMenu = mPopupMenu.getMenu(); // 获取菜单对象
+        mPopupMenu.getMenuInflater().inflate(menuId, mMenu); // 加载菜单资源到菜单对象
+        mButton.setOnClickListener(new OnClickListener() { // 为按钮设置点击监听器
+            public void onClick(View v) {
+                mPopupMenu.show(); // 显示下拉菜单
+            }
+        });
+    }
+
+    // 设置下拉菜单项点击事件的监听器
+    public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
+        if (mPopupMenu != null) {
+            mPopupMenu.setOnMenuItemClickListener(listener); // 绑定菜单项点击事件监听器
+        }
+    }
+
+    // 根据ID查找菜单项
+    public MenuItem findItem(int id) {
+        return mMenu.findItem(id); // 返回指定ID的菜单项
+    }
+
+    // 设置按钮标题
+    public void setTitle(CharSequence title) {
+        mButton.setText(title); // 设置按钮显示的标题
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/FoldersListAdapter.java

@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// FoldersListAdapter.java 文件
+package net.micode.xiaomi_note.ui; // 定义包名，表示该文件属于 net.micode.xiaomi_note 包下的 ui 子包
+
+// 导入必要的类
+import android.content.Context; // 提供上下文环境，用于访问资源或服务
+import android.database.Cursor; // 用于查询数据库结果集的操作
+import android.view.View; // 基础视图类，所有 UI 组件的基类
+import android.view.ViewGroup; // 视图容器的基类，用于布局管理
+import android.widget.CursorAdapter; // 用于将 Cursor 数据绑定到 ListView 的适配器
+import android.widget.LinearLayout; // 线性布局管理器
+import android.widget.TextView; // 显示文本的控件
+
+// 导入项目内部的资源和数据类
+import net.micode.xiaomi_note.R; // 引入项目的资源文件
+import net.micode.xiaomi_note.data.Notes; // 引入笔记相关的数据模型
+import net.micode.xiaomi_note.data.Notes.NoteColumns; // 引入笔记表中的列定义
+
+
+// 定义一个继承自CursorAdapter的适配器类，用于管理文件夹列表的数据展示
+public class FoldersListAdapter extends CursorAdapter {
+
+    // 定义查询投影，指定需要从数据库中获取的列
+    public static final String [] PROJECTION = {
+            NoteColumns.ID,    // 文件夹ID列
+            NoteColumns.SNIPPET // 文件夹名称片段列
+    };
+
+    // 定义列索引常量，用于快速定位查询结果中的特定列
+    public static final int ID_COLUMN   = 0;  // ID列的索引
+    public static final int NAME_COLUMN = 1;  // 名称片段列的索引
+
+    // 构造函数，初始化适配器
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);  // 调用父类构造函数，传入上下文和游标
+        // TODO: 需要实现具体的构造逻辑
+    }
+
+    // 创建一个新的视图项（FolderListItem），用于显示文件夹列表项
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new FolderListItem(context);  // 返回一个新的FolderListItem实例
+    }
+
+    // 将数据绑定到已有的视图项上
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {  // 确保视图是FolderListItem类型
+            // 根据条件设置文件夹名称
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ?
+                    context.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            // 调用FolderListItem的bind方法更新UI
+            ((FolderListItem) view).bind(folderName);
+        }
+    }
+
+    // 获取指定位置的文件夹名称
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);  // 获取指定位置的游标
+        // 根据条件返回文件夹名称
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ?
+                context.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }
+
+    // 内部类：定义文件夹列表项的视图组件
+    private class FolderListItem extends LinearLayout {
+        private TextView mName;  // 文件夹名称的TextView控件
+
+        // 构造函数，初始化文件夹列表项视图
+        public FolderListItem(Context context) {
+            super(context);
+            inflate(context, R.layout.folder_list_item, this);  // 加载布局文件
+            mName = (TextView) findViewById(R.id.tv_folder_name);  // 查找TextView控件
+        }
+
+        // 绑定数据到视图上
+        public void bind(String name) {
+            mName.setText(name);  // 设置文件夹名称文本
+        }
+    }
+
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/NoteEditText.java

@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui; // 定义包名
+
+// 导入必要的类和库
+import android.content.Context; // 提供应用环境信息
+import android.graphics.Rect; // 用于定义矩形区域
+import android.text.Layout; // 提供文本布局信息
+import android.text.Selection; // 提供文本选择功能
+import android.text.Spanned; // 表示带有跨度的文本
+import android.text.TextUtils; // 提供文本操作工具
+import android.text.style.URLSpan; // 用于处理超链接样式
+import android.util.AttributeSet; // 提供自定义视图属性
+import android.util.Log; // 日志记录工具
+import android.view.ContextMenu; // 上下文菜单相关
+import android.view.KeyEvent; // 键事件处理
+import android.view.MenuItem; // 菜单项
+import android.view.MenuItem.OnMenuItemClickListener; // 菜单项点击监听器
+import android.view.MotionEvent; // 触摸事件
+
+import androidx.appcompat.widget.AppCompatEditText; // 兼容性 EditText 类
+
+import net.micode.xiaomi_note.R; // 引入资源文件
+
+import java.util.HashMap; // 哈希表数据结构
+import java.util.Map; // 映射接口
+
+public class NoteEditText extends AppCompatEditText {
+    private static final String TAG = "NoteEditText"; // 日志标签，用于调试信息输出
+    private int mIndex; // 当前编辑框的索引
+    private int mSelectionStartBeforeDelete; // 删除操作前的光标位置
+
+    private static final String SCHEME_TEL = "tel:" ; // 电话协议
+    private static final String SCHEME_HTTP = "http:" ; // HTTP协议
+    private static final String SCHEME_EMAIL = "mailto:" ; // 邮件协议
+
+    private static final Map<String, Integer> sSchemaActionResMap = new HashMap<String, Integer>(); // 协议与资源ID映射表
+    static {
+        sSchemaActionResMap.put(SCHEME_TEL, R.string.note_link_tel); // 电话协议对应的资源ID
+        sSchemaActionResMap.put(SCHEME_HTTP, R.string.note_link_web); // HTTP协议对应的资源ID
+        sSchemaActionResMap.put(SCHEME_EMAIL, R.string.note_link_email); // 邮件协议对应的资源ID
+    }
+
+    /**
+     * 回调接口，由{@link NoteEditActivity}实现，用于删除或新增编辑框
+     */
+    public interface OnTextViewChangeListener {
+        /**
+         * 删除当前编辑框，当按下删除键且文本为空时触发
+         */
+        void onEditTextDelete(int index, String text);
+
+        /**
+         * 在当前编辑框后新增编辑框，当按下回车键时触发
+         */
+        void onEditTextEnter(int index, String text);
+
+        /**
+         * 文本变化时隐藏或显示项目选项
+         */
+        void onTextChange(int index, boolean hasText);
+    }
+
+    private OnTextViewChangeListener mOnTextViewChangeListener; // 编辑框内容变化监听器
+
+    public NoteEditText(Context context) {
+        super(context); // 调用父类构造函数
+        mIndex = 0; // 初始化索引
+    }
+
+    public void setIndex(int index) { // 设置当前编辑框的索引
+        mIndex = index;
+    }
+
+    public void setOnTextViewChangeListener(OnTextViewChangeListener listener) { // 设置内容变化监听器
+        mOnTextViewChangeListener = listener;
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs) {
+        super(context, attrs, android.R.attr.editTextStyle); // 调用父类构造函数
+    }
+
+    public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle); // 调用父类构造函数
+        // TODO: 自动生成的构造函数占位符
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        switch (event.getAction()) { // 处理触摸事件
+            case MotionEvent.ACTION_DOWN:
+                int x = (int) event.getX(); // 获取触摸点的X坐标
+                int y = (int) event.getY(); // 获取触摸点的Y坐标
+                x -= getTotalPaddingLeft(); // 调整X坐标
+                y -= getTotalPaddingTop(); // 调整Y坐标
+                x += getScrollX(); // 添加滚动偏移
+                y += getScrollY(); // 添加滚动偏移
+                Layout layout = getLayout(); // 获取布局对象
+                int line = layout.getLineForVertical(y); // 获取点击行号
+                int off = layout.getOffsetForHorizontal(line, x); // 获取水平偏移对应的字符位置
+                Selection.setSelection(getText(), off); // 设置选中位置
+                break;
+        }
+        return super.onTouchEvent(event); // 调用父类方法处理事件
+    }
+
+    @Override
+    public boolean onKeyDown(int keyCode, KeyEvent event) {
+        switch (keyCode) { // 处理按键事件
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    return false; // 不执行默认行为
+                }
+                break;
+            case KeyEvent.KEYCODE_DEL:
+                mSelectionStartBeforeDelete = getSelectionStart(); // 记录删除前的光标位置
+                break;
+            default:
+                break;
+        }
+        return super.onKeyDown(keyCode, event); // 调用父类方法处理事件
+    }
+
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        switch(keyCode) { // 处理按键抬起事件
+            case KeyEvent.KEYCODE_DEL:
+                if (mOnTextViewChangeListener != null) {
+                    if (0 == mSelectionStartBeforeDelete && mIndex != 0) { // 如果光标在首位且不是第一个编辑框
+                        mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString()); // 触发删除回调
+                        return true; // 拦截事件
+                    }
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted"); // 日志提示未设置监听器
+                }
+                break;
+            case KeyEvent.KEYCODE_ENTER:
+                if (mOnTextViewChangeListener != null) {
+                    int selectionStart = getSelectionStart(); // 获取当前选中起始位置
+                    String text = getText().subSequence(selectionStart, length()).toString(); // 截取后续文本
+                    setText(getText().subSequence(0, selectionStart)); // 设置文本为选中前部分
+                    mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text); // 触发新增回调
+                } else {
+                    Log.d(TAG, "OnTextViewChangeListener was not seted"); // 日志提示未设置监听器
+                }
+                break;
+            default:
+                break;
+        }
+        return super.onKeyUp(keyCode, event); // 调用父类方法处理事件
+    }
+
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (mOnTextViewChangeListener != null) {
+            if (!focused && TextUtils.isEmpty(getText())) { // 如果失去焦点且文本为空
+                mOnTextViewChangeListener.onTextChange(mIndex, false); // 触发文本为空回调
+            } else {
+                mOnTextViewChangeListener.onTextChange(mIndex, true); // 触发文本非空回调
+            }
+        }
+        super.onFocusChanged(focused, direction, previouslyFocusedRect); // 调用父类方法处理焦点变化
+    }
+
+    @Override
+    protected void onCreateContextMenu(ContextMenu menu) {
+        if (getText() instanceof Spanned) { // 如果文本是可扩展的
+            int selStart = getSelectionStart(); // 获取选区起点
+            int selEnd = getSelectionEnd(); // 获取选区终点
+            int min = Math.min(selStart, selEnd); // 计算最小值
+            int max = Math.max(selStart, selEnd); // 计算最大值
+            final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class); // 获取选中的URLSpan
+            if (urls.length == 1) { // 如果选中一个URL
+                int defaultResId = 0;
+                for(String schema: sSchemaActionResMap.keySet()) { // 遍历协议映射表
+                    if(urls[0].getURL().indexOf(schema) >= 0) { // 如果URL包含该协议
+                        defaultResId = sSchemaActionResMap.get(schema); // 获取对应的资源ID
+                        break;
+                    }
+                }
+                if (defaultResId == 0) { // 如果未找到匹配协议
+                    defaultResId = R.string.note_link_other; // 使用默认资源ID
+                }
+                menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener( // 添加上下文菜单项
+                        new OnMenuItemClickListener() {
+                            public boolean onMenuItemClick(MenuItem item) {
+                                // 跳转到新意图
+                                urls[0].onClick(NoteEditText.this);
+                                return true;
+                            }
+                        });
+            }
+        }
+        super.onCreateContextMenu(menu); // 调用父类方法创建上下文菜单
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/NoteItemData.java

@@ -0,0 +1,311 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui; // 定义包名
+
+// 导入必要的类和库
+import android.content.Context; // 提供应用环境信息
+import android.database.Cursor; // 数据库游标，用于查询结果
+import android.text.TextUtils; // 提供文本操作工具
+
+import net.micode.xiaomi_note.data.Contact; // 联系人数据模型
+import net.micode.xiaomi_note.data.Notes; // 笔记数据模型
+import net.micode.xiaomi_note.data.Notes.NoteColumns; // 笔记表的列定义
+import net.micode.xiaomi_note.tool.DataUtils; // 工具类，提供通用方法
+
+
+/**
+ * 笔记项数据模型类，用于表示和封装单条笔记的数据
+ */
+public class NoteItemData {
+    // 数据库查询字段投影数组，定义需要从数据库中查询的列
+    static final String [] PROJECTION = new String [] {
+            NoteColumns.ID,                // 笔记唯一标识符
+            NoteColumns.ALERTED_DATE,      // 提醒时间（时间戳）
+            NoteColumns.BG_COLOR_ID,       // 背景颜色资源ID
+            NoteColumns.CREATED_DATE,      // 创建时间（时间戳）
+            NoteColumns.HAS_ATTACHMENT,    // 是否有附件（0/1）
+            NoteColumns.MODIFIED_DATE,     // 最后修改时间（时间戳）
+            NoteColumns.NOTES_COUNT,       // 包含的子笔记数量（用于文件夹）
+            NoteColumns.PARENT_ID,         // 父笔记ID（用于构建层级结构）
+            NoteColumns.SNIPPET,           // 内容摘要（显示在列表中的预览文本）
+            NoteColumns.TYPE,              // 笔记类型（普通笔记/文件夹/系统笔记等）
+            NoteColumns.WIDGET_ID,         // 关联的小部件ID
+            NoteColumns.WIDGET_TYPE,       // 小部件类型（2x1,4x2等）
+    };
+
+    // 列索引常量，对应PROJECTION数组中的位置
+    private static final int ID_COLUMN            = 0;  // ID字段在游标中的位置
+    private static final int ALERTED_DATE_COLUMN  = 1;  // 提醒日期字段位置
+    private static final int BG_COLOR_ID_COLUMN   = 2;  // 背景颜色字段位置
+    private static final int CREATED_DATE_COLUMN  = 3;  // 创建时间字段位置
+    private static final int HAS_ATTACHMENT_COLUMN= 4;  // 附件标记字段位置
+    private static final int MODIFIED_DATE_COLUMN = 5;  // 修改时间字段位置
+    private static final int NOTES_COUNT_COLUMN   = 6;  // 笔记数量字段位置
+    private static final int PARENT_ID_COLUMN     = 7;  // 父ID字段位置
+    private static final int SNIPPET_COLUMN       = 8;  // 内容摘要字段位置
+    private static final int TYPE_COLUMN          = 9;  // 类型字段位置
+    private static final int WIDGET_ID_COLUMN     = 10; // 小部件ID字段位置
+    private static final int WIDGET_TYPE_COLUMN   = 11; // 小部件类型字段位置
+
+    // 笔记数据字段
+    private long mId;                  // 笔记唯一ID（对应数据库主键）
+    private long mAlertDate;           // 提醒时间（0表示未设置提醒）
+    private int mBgColorId;            // 背景颜色资源ID
+    private long mCreatedDate;         // 创建时间戳（毫秒）
+    private boolean mHasAttachment;    // 是否有附件（图片/音频等）
+    private long mModifiedDate;        // 最后修改时间戳
+    private int mNotesCount;           // 子项数量（当这是文件夹时有效）
+    private long mParentId;            // 父笔记ID（用于构建树形结构）
+    private String mSnippet;           // 内容预览（处理后去掉了复选框标记）
+    private int mType;                 // 笔记类型（见Notes.TYPE_*常量）
+    private int mWidgetId;             // 关联的小部件ID（0表示未关联）
+    private int mWidgetType;           // 小部件类型（见Notes.TYPE_WIDGET_*）
+
+    // 联系人相关字段（当笔记是通话记录时使用）
+    private String mName;              // 联系人姓名（通话记录专用）
+    private String mPhoneNumber;       // 电话号码（通话记录专用）
+
+    // 列表位置状态标记（用于UI渲染）
+    private boolean mIsLastItem;       // 是否是列表中的最后一项
+    private boolean mIsFirstItem;      // 是否是列表中的第一项
+    private boolean mIsOnlyOneItem;    // 是否是列表中的唯一项
+    private boolean mIsOneNoteFollowingFolder;  // 是否是一个笔记紧跟在文件夹后面
+    private boolean mIsMultiNotesFollowingFolder; // 是否是多个笔记紧跟在文件夹后面
+
+    public NoteItemData(Context context, Cursor cursor) {
+        // 获取数据库游标中的ID列值，并赋值给成员变量mId
+        mId = cursor.getLong(ID_COLUMN);
+
+        // 获取数据库游标中的提醒日期列值，并赋值给成员变量mAlertDate
+        mAlertDate = cursor.getLong(ALERTED_DATE_COLUMN);
+
+        // 获取数据库游标中的背景颜色ID列值，并赋值给成员变量mBgColorId
+        mBgColorId = cursor.getInt(BG_COLOR_ID_COLUMN);
+
+        // 获取数据库游标中的创建日期列值，并赋值给成员变量mCreatedDate
+        mCreatedDate = cursor.getLong(CREATED_DATE_COLUMN);
+
+        // 判断是否有附件，若有则将成员变量mHasAttachment设为true
+        mHasAttachment = (cursor.getInt(HAS_ATTACHMENT_COLUMN) > 0) ? true : false;
+
+        // 获取数据库游标中的修改日期列值，并赋值给成员变量mModifiedDate
+        mModifiedDate = cursor.getLong(MODIFIED_DATE_COLUMN);
+
+        // 获取数据库游标中的笔记数量列值，并赋值给成员变量mNotesCount
+        mNotesCount = cursor.getInt(NOTES_COUNT_COLUMN);
+
+        // 获取数据库游标中的父ID列值，并赋值给成员变量mParentId
+        mParentId = cursor.getLong(PARENT_ID_COLUMN);
+
+        // 获取数据库游标中的摘要列值，并赋值给成员变量mSnippet
+        mSnippet = cursor.getString(SNIPPET_COLUMN);
+
+        // 去除摘要中的特定标签字符
+        mSnippet = mSnippet.replace(NoteEditActivity.TAG_CHECKED, "").replace(
+                NoteEditActivity.TAG_UNCHECKED, "");
+
+        // 获取数据库游标中的类型列值，并赋值给成员变量mType
+        mType = cursor.getInt(TYPE_COLUMN);
+
+        // 获取数据库游标中的小部件ID列值，并赋值给成员变量mWidgetId
+        mWidgetId = cursor.getInt(WIDGET_ID_COLUMN);
+
+        // 获取数据库游标中的小部件类型列值，并赋值给成员变量mWidgetType
+        mWidgetType = cursor.getInt(WIDGET_TYPE_COLUMN);
+
+        // 初始化电话号码为空字符串
+        mPhoneNumber = "";
+
+        // 如果父ID等于通话记录文件夹ID，则执行相关操作
+        if (mParentId == Notes.ID_CALL_RECORD_FOLDER) {
+            // 获取与笔记ID关联的通话号码
+            mPhoneNumber = DataUtils.getCallNumberByNoteId(context.getContentResolver(), mId);
+
+            // 如果电话号码不为空，则尝试获取联系人名称
+            if (!TextUtils.isEmpty(mPhoneNumber)) {
+                mName = Contact.getContact(context, mPhoneNumber);
+
+                // 如果联系人名称为空，则使用电话号码作为名称
+                if (mName == null) {
+                    mName = mPhoneNumber;
+                }
+            }
+        }
+
+        // 如果联系人名称仍为空，则初始化为空字符串
+        if (mName == null) {
+            mName = "";
+        }
+
+        // 调用检查位置的方法
+        checkPostion(cursor);
+    }
+
+    // 检查当前游标的位置状态
+    private void checkPostion(Cursor cursor) {
+        // 判断当前游标是否是最后一个元素，并赋值给成员变量mIsLastItem
+        mIsLastItem = cursor.isLast() ? true : false;
+
+        // 判断当前游标是否是第一个元素，并赋值给成员变量mIsFirstItem
+        mIsFirstItem = cursor.isFirst() ? true : false;
+
+        // 判断当前游标是否只有一个元素，并赋值给成员变量mIsOnlyOneItem
+        mIsOnlyOneItem = (cursor.getCount() == 1);
+
+        // 初始化多条笔记后跟文件夹标志位
+        mIsMultiNotesFollowingFolder = false;
+
+        // 初始化一条笔记后跟文件夹标志位
+        mIsOneNoteFollowingFolder = false;
+
+        // 如果当前笔记类型为普通笔记且不是第一个元素
+        if (mType == Notes.TYPE_NOTE && !mIsFirstItem) {
+            // 获取当前游标的位置
+            int position = cursor.getPosition();
+
+            // 将游标移动到前一个位置
+            if (cursor.moveToPrevious()) {
+                // 如果前一个元素类型为文件夹或系统类型
+                if (cursor.getInt(TYPE_COLUMN) == Notes.TYPE_FOLDER
+                        || cursor.getInt(TYPE_COLUMN) == Notes.TYPE_SYSTEM) {
+                    // 如果游标之后还有更多元素，则设置多条笔记后跟文件夹标志位
+                    if (cursor.getCount() > (position + 1)) {
+                        mIsMultiNotesFollowingFolder = true;
+                    } else {
+                        // 否则设置一条笔记后跟文件夹标志位
+                        mIsOneNoteFollowingFolder = true;
+                    }
+                }
+
+                // 尝试将游标移回原位置，若失败则抛出异常
+                if (!cursor.moveToNext()) {
+                    throw new IllegalStateException("cursor move to previous but can't move back");
+                }
+            }
+        }
+    }
+
+    public boolean isOneFollowingFolder() {
+        // 判断当前项是否是仅跟随一个文件夹的标记
+        return mIsOneNoteFollowingFolder;
+    }
+
+    public boolean isMultiFollowingFolder() {
+        // 判断当前项是否是跟随多个文件夹的标记
+        return mIsMultiNotesFollowingFolder;
+    }
+
+    public boolean isLast() {
+        // 判断当前项是否是最后一个项目的标记
+        return mIsLastItem;
+    }
+
+    public String getCallName() {
+        // 获取当前项的呼叫名称
+        return mName;
+    }
+
+    public boolean isFirst() {
+        // 判断当前项是否是第一个项目的标记
+        return mIsFirstItem;
+    }
+
+    public boolean isSingle() {
+        // 判断当前项是否是唯一一项的标记
+        return mIsOnlyOneItem;
+    }
+
+    public long getId() {
+        // 获取当前项的唯一标识符ID
+        return mId;
+    }
+
+    public long getAlertDate() {
+        // 获取当前项的提醒日期
+        return mAlertDate;
+    }
+
+    public long getCreatedDate() {
+        // 获取当前项的创建日期
+        return mCreatedDate;
+    }
+
+    public boolean hasAttachment() {
+        // 判断当前项是否有附件的标记
+        return mHasAttachment;
+    }
+
+    public long getModifiedDate() {
+        // 获取当前项的最后修改日期
+        return mModifiedDate;
+    }
+
+    public int getBgColorId() {
+        // 获取当前项的背景颜色ID
+        return mBgColorId;
+    }
+
+    public long getParentId() {
+        // 获取当前项的父级ID
+        return mParentId;
+    }
+
+    public int getNotesCount() {
+        // 获取当前项关联的笔记数量
+        return mNotesCount;
+    }
+
+    public long getFolderId () {
+        // 获取当前项所属文件夹的ID（与getParentId方法相同）
+        return mParentId;
+    }
+
+    public int getType() {
+        // 获取当前项的类型
+        return mType;
+    }
+
+    public int getWidgetType() {
+        // 获取当前项的小部件类型
+        return mWidgetType;
+    }
+
+    public int getWidgetId() {
+        // 获取当前项的小部件ID
+        return mWidgetId;
+    }
+
+    public String getSnippet() {
+        // 获取当前项的摘要信息
+        return mSnippet;
+    }
+
+    public boolean hasAlert() {
+        // 判断当前项是否有设置提醒的标记
+        return (mAlertDate > 0);
+    }
+
+    public boolean isCallRecord() {
+        // 判断当前项是否是通话记录的标记
+        return (mParentId == Notes.ID_CALL_RECORD_FOLDER && !TextUtils.isEmpty(mPhoneNumber));
+    }
+
+    public static int getNoteType(Cursor cursor) {
+        // 从游标中获取笔记类型的整数值
+        return cursor.getInt(TYPE_COLUMN);
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/NotesListAdapter.java

@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.util.Log;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+
+import net.micode.xiaomi_note.data.Notes;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+
+/**
+ * 用于管理笔记列表的适配器类，继承自 CursorAdapter。
+ * 提供了选择模式、计数以及绑定视图等功能。
+ */
+public class NotesListAdapter extends CursorAdapter {
+    private static final String TAG = "NotesListAdapter"; // 日志标签
+    private Context mContext; // 上下文对象
+    private HashMap<Integer, Boolean> mSelectedIndex; // 存储选中项的索引和状态
+    private int mNotesCount; // 笔记总数
+    private boolean mChoiceMode; // 是否处于选择模式
+
+    /**
+     * 定义小部件属性类，用于存储小部件ID和类型。
+     */
+    public static class AppWidgetAttribute {
+        public int widgetId; // 小部件ID
+        public int widgetType; // 小部件类型
+    };
+
+    /**
+     * 构造函数，初始化适配器。
+     * @param context 当前上下文
+     */
+    public NotesListAdapter(Context context) {
+        super(context, null); // 调用父类构造函数
+        mSelectedIndex = new HashMap<Integer, Boolean>(); // 初始化选中索引映射表
+        mContext = context; // 设置上下文
+        mNotesCount = 0; // 初始化笔记总数为0
+    }
+
+    /**
+     * 创建一个新的视图以显示数据项。
+     * @param context 上下文
+     * @param cursor 数据游标
+     * @param parent 父容器
+     * @return 新创建的视图
+     */
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        return new NotesListItem(context); // 返回一个新实例化的NotesListItem
+    }
+
+    /**
+     * 绑定数据到指定视图。
+     * @param view 要绑定数据的视图
+     * @param context 上下文
+     * @param cursor 数据游标
+     */
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof NotesListItem) { // 检查视图是否为NotesListItem类型
+            NoteItemData itemData = new NoteItemData(context, cursor); // 创建NoteItemData对象
+            ((NotesListItem) view).bind(context, itemData, mChoiceMode, // 绑定数据到视图
+                    isSelectedItem(cursor.getPosition()));
+        }
+    }
+
+    /**
+     * 设置某个位置的选中状态。
+     * @param position 位置索引
+     * @param checked 是否选中
+     */
+    public void setCheckedItem(final int position, final boolean checked) {
+        mSelectedIndex.put(position, checked); // 更新选中状态
+        notifyDataSetChanged(); // 通知数据集已改变
+    }
+
+    /**
+     * 判断当前是否处于选择模式。
+     * @return 是否处于选择模式
+     */
+    public boolean isInChoiceMode() {
+        return mChoiceMode; // 返回选择模式标志
+    }
+
+    /**
+     * 设置选择模式。
+     * @param mode 是否开启选择模式
+     */
+    public void setChoiceMode(boolean mode) {
+        mSelectedIndex.clear(); // 清空选中状态
+        mChoiceMode = mode; // 设置选择模式标志
+    }
+
+    /**
+     * 批量选中或取消选中所有项。
+     * @param checked 是否选中
+     */
+    public void selectAll(boolean checked) {
+        Cursor cursor = getCursor(); // 获取数据游标
+        for (int i = 0; i < getCount(); i++) { // 遍历所有数据项
+            if (cursor.moveToPosition(i)) { // 移动到指定位置
+                if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) { // 判断是否为笔记类型
+                    setCheckedItem(i, checked); // 设置选中状态
+                }
+            }
+        }
+    }
+
+    /**
+     * 获取选中的项目ID集合。
+     * @return 选中的项目ID集合
+     */
+    public HashSet<Long> getSelectedItemIds() {
+        HashSet<Long> itemSet = new HashSet<Long>(); // 初始化结果集合
+        for (Integer position : mSelectedIndex.keySet()) { // 遍历选中索引
+            if (mSelectedIndex.get(position) == true) { // 如果选中
+                Long id = getItemId(position); // 获取项目ID
+                if (id == Notes.ID_ROOT_FOLDER) { // 如果ID为根文件夹ID
+                    Log.d(TAG, "Wrong item id, should not happen"); // 记录日志
+                } else {
+                    itemSet.add(id); // 添加到结果集合
+                }
+            }
+        }
+        return itemSet; // 返回结果集合
+    }
+
+    /**
+     * 获取选中的小部件属性集合。
+     * @return 选中的小部件属性集合
+     */
+    public HashSet<AppWidgetAttribute> getSelectedWidget() {
+        HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>(); // 初始化结果集合
+        for (Integer position : mSelectedIndex.keySet()) { // 遍历选中索引
+            if (mSelectedIndex.get(position) == true) { // 如果选中
+                Cursor c = (Cursor) getItem(position); // 获取数据游标
+                if (c != null) { // 检查游标是否有效
+                    AppWidgetAttribute widget = new AppWidgetAttribute(); // 初始化小部件属性对象
+                    NoteItemData item = new NoteItemData(mContext, c); // 创建NoteItemData对象
+                    widget.widgetId = item.getWidgetId(); // 设置小部件ID
+                    widget.widgetType = item.getWidgetType(); // 设置小部件类型
+                    itemSet.add(widget); // 添加到结果集合
+                    /**
+                     * 不关闭游标，只有适配器可以关闭游标
+                     */
+                } else {
+                    Log.e(TAG, "Invalid cursor"); // 记录错误日志
+                    return null; // 返回空值
+                }
+            }
+        }
+        return itemSet; // 返回结果集合
+    }
+
+    /**
+     * 获取选中的项目数量。
+     * @return 选中的项目数量
+     */
+    public int getSelectedCount() {
+        Collection<Boolean> values = mSelectedIndex.values(); // 获取选中状态集合
+        if (null == values) { // 如果集合为空
+            return 0; // 返回0
+        }
+        Iterator<Boolean> iter = values.iterator(); // 获取迭代器
+        int count = 0; // 初始化计数器
+        while (iter.hasNext()) { // 遍历集合
+            if (true == iter.next()) { // 如果选中
+                count++; // 增加计数器
+            }
+        }
+        return count; // 返回选中数量
+    }
+
+    /**
+     * 判断是否所有项目都被选中。
+     * @return 是否所有项目都被选中
+     */
+    public boolean isAllSelected() {
+        int checkedCount = getSelectedCount(); // 获取选中数量
+        return (checkedCount != 0 && checkedCount == mNotesCount); // 判断是否等于总数量
+    }
+
+    /**
+     * 判断指定位置的项目是否被选中。
+     * @param position 位置索引
+     * @return 是否被选中
+     */
+    public boolean isSelectedItem(final int position) {
+        if (null == mSelectedIndex.get(position)) { // 如果索引不存在
+            return false; // 返回未选中
+        }
+        return mSelectedIndex.get(position); // 返回选中状态
+    }
+
+    /**
+     * 当内容发生变化时调用的方法。
+     */
+    @Override
+    protected void onContentChanged() {
+        super.onContentChanged(); // 调用父类方法
+        calcNotesCount(); // 计算笔记总数
+    }
+
+    /**
+     * 更改数据游标时调用的方法。
+     * @param cursor 新的数据游标
+     */
+    @Override
+    public void changeCursor(Cursor cursor) {
+        super.changeCursor(cursor); // 调用父类方法
+        calcNotesCount(); // 计算笔记总数
+    }
+
+    /**
+     * 计算笔记总数。
+     */
+    private void calcNotesCount() {
+        mNotesCount = 0; // 初始化笔记总数为0
+        for (int i = 0; i < getCount(); i++) { // 遍历所有数据项
+            Cursor c = (Cursor) getItem(i); // 获取数据游标
+            if (c != null) { // 检查游标是否有效
+                if (NoteItemData.getNoteType(c) == Notes.TYPE_NOTE) { // 判断是否为笔记类型
+                    mNotesCount++; // 增加笔记总数
+                }
+            } else {
+                Log.e(TAG, "Invalid cursor"); // 记录错误日志
+                return; // 结束方法
+            }
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/NotesListItem.java

@@ -0,0 +1,107 @@
+// NotesListItem.java 文件定义了一个自定义的 LinearLayout，用于显示笔记列表项。
+
+package net.micode.xiaomi_note.ui;
+
+import android.content.Context; // 导入 Context 类，用于获取应用上下文信息
+import android.text.format.DateUtils; // 导入 DateUtils 工具类，用于格式化时间
+import android.view.View; // 导入 View 类，用于操作视图组件
+import android.widget.CheckBox; // 导入 CheckBox，用于多选模式下的复选框
+import android.widget.ImageView; // 导入 ImageView，用于显示图标
+import android.widget.LinearLayout; // 导入 LinearLayout，作为该类的基类
+import android.widget.TextView; // 导入 TextView，用于显示文本
+
+import net.micode.xiaomi_note.R; // 导入资源文件中的常量
+import net.micode.xiaomi_note.data.Notes; // 导入 Notes 数据模型
+import net.micode.xiaomi_note.tool.DataUtils; // 导入工具类 DataUtils
+import net.micode.xiaomi_note.tool.ResourceParser.NoteItemBgResources; // 导入背景资源解析器
+
+public class NotesListItem extends LinearLayout { // 定义一个继承自 LinearLayout 的自定义视图类
+    private ImageView mAlert; // 声明一个 ImageView，用于显示提醒图标
+    private TextView mTitle; // 声明一个 TextView，用于显示标题
+    private TextView mTime; // 声明一个 TextView，用于显示时间
+    private TextView mCallName; // 声明一个 TextView，用于显示通话名称
+    private NoteItemData mItemData; // 声明一个 NoteItemData 对象，存储当前列表项的数据
+    private CheckBox mCheckBox; // 声明一个 CheckBox，用于多选模式下的复选框
+
+    public NotesListItem(Context context) { // 构造函数，初始化视图
+        super(context); // 调用父类构造函数
+        inflate(context, R.layout.note_item, this); // 使用布局文件 note_item 初始化视图
+        mAlert = (ImageView) findViewById(R.id.iv_alert_icon); // 获取提醒图标控件
+        mTitle = (TextView) findViewById(R.id.tv_title); // 获取标题控件
+        mTime = (TextView) findViewById(R.id.tv_time); // 获取时间控件
+        mCallName = (TextView) findViewById(R.id.tv_name); // 获取通话名称控件
+        mCheckBox = (CheckBox) findViewById(android.R.id.checkbox); // 获取复选框控件
+    }
+
+    public void bind(Context context, NoteItemData data, boolean choiceMode, boolean checked) { // 绑定数据到视图
+        if (choiceMode && data.getType() == Notes.TYPE_NOTE) { // 如果处于选择模式且类型为笔记
+            mCheckBox.setVisibility(View.VISIBLE); // 显示复选框
+            mCheckBox.setChecked(checked); // 设置复选框状态
+        } else {
+            mCheckBox.setVisibility(View.GONE); // 否则隐藏复选框
+        }
+
+        mItemData = data; // 存储当前数据对象
+        if (data.getId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录文件夹
+            mCallName.setVisibility(View.GONE); // 隐藏通话名称
+            mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题样式
+            mTitle.setText(context.getString(R.string.call_record_folder_name) // 设置标题文本
+                    + context.getString(R.string.format_folder_files_count, data.getNotesCount()));
+            mAlert.setImageResource(R.drawable.call_record); // 设置提醒图标资源
+        } else if (data.getParentId() == Notes.ID_CALL_RECORD_FOLDER) { // 如果是通话记录子项
+            mCallName.setVisibility(View.VISIBLE); // 显示通话名称
+            mCallName.setText(data.getCallName()); // 设置通话名称文本
+            mTitle.setTextAppearance(context, R.style.TextAppearanceSecondaryItem); // 设置标题样式
+            mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题文本
+            if (data.hasAlert()) { // 如果有提醒
+                mAlert.setImageResource(R.drawable.clock); // 设置提醒图标资源
+                mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+            } else {
+                mAlert.setVisibility(View.GONE); // 否则隐藏提醒图标
+            }
+        } else { // 其他情况（普通笔记或文件夹）
+            mCallName.setVisibility(View.GONE); // 隐藏通话名称
+            mTitle.setTextAppearance(context, R.style.TextAppearancePrimaryItem); // 设置标题样式
+
+            if (data.getType() == Notes.TYPE_FOLDER) { // 如果是文件夹
+                mTitle.setText(data.getSnippet() // 设置标题文本
+                        + context.getString(R.string.format_folder_files_count,
+                        data.getNotesCount()));
+                mAlert.setVisibility(View.GONE); // 隐藏提醒图标
+            } else { // 如果是普通笔记
+                mTitle.setText(DataUtils.getFormattedSnippet(data.getSnippet())); // 设置标题文本
+                if (data.hasAlert()) { // 如果有提醒
+                    mAlert.setImageResource(R.drawable.clock); // 设置提醒图标资源
+                    mAlert.setVisibility(View.VISIBLE); // 显示提醒图标
+                } else {
+                    mAlert.setVisibility(View.GONE); // 否则隐藏提醒图标
+                }
+            }
+        }
+        mTime.setText(DateUtils.getRelativeTimeSpanString(data.getModifiedDate())); // 设置时间文本
+
+        setBackground(data); // 设置背景
+    }
+
+    private void setBackground(NoteItemData data) { // 设置背景资源
+        int id = data.getBgColorId(); // 获取背景颜色 ID
+        if (data.getType() == Notes.TYPE_NOTE) { // 如果是笔记
+            if (data.isSingle() || data.isOneFollowingFolder()) { // 如果是单个笔记或跟随文件夹的第一个
+                setBackgroundResource(NoteItemBgResources.getNoteBgSingleRes(id)); // 设置单个笔记背景
+            } else if (data.isLast()) { // 如果是最后一个笔记
+                setBackgroundResource(NoteItemBgResources.getNoteBgLastRes(id)); // 设置最后一个笔记背景
+            } else if (data.isFirst() || data.isMultiFollowingFolder()) { // 如果是第一个笔记或多个跟随文件夹
+                setBackgroundResource(NoteItemBgResources.getNoteBgFirstRes(id)); // 设置第一个笔记背景
+            } else { // 其他情况
+                setBackgroundResource(NoteItemBgResources.getNoteBgNormalRes(id)); // 设置普通笔记背景
+            }
+        } else { // 如果是文件夹
+            setBackgroundResource(NoteItemBgResources.getFolderBgRes()); // 设置文件夹背景
+        }
+    }
+
+    public NoteItemData getItemData() { // 获取当前数据对象
+        return mItemData; // 返回数据对象
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/ui/NotesPreferenceActivity.java

@@ -0,0 +1,376 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.xiaomi_note.ui; // 包名定义
+
+// 导入必要的类
+import android.accounts.Account;
+import android.accounts.AccountManager;
+import android.app.ActionBar;
+import android.app.AlertDialog;
+import android.content.BroadcastReceiver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceClickListener;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceCategory;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.gtask.remote.GTaskSyncService;
+
+// 定义偏好设置活动类
+public class NotesPreferenceActivity extends PreferenceActivity {
+    public static final String PREFERENCE_NAME = "notes_preferences"; // 共享偏好文件名
+    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name"; // 同步账户名称键
+    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time"; // 最后同步时间键
+    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear"; // 背景颜色随机出现键
+    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key"; // 同步账户键
+    private static final String AUTHORITIES_FILTER_KEY = "authorities"; // 权限过滤键
+
+    private PreferenceCategory mAccountCategory; // 账户类别偏好
+    private GTaskReceiver mReceiver; // 广播接收器
+    private Account[] mOriAccounts; // 原始账户数组
+    private boolean mHasAddedAccount; // 是否已添加账户标志
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        /* 使用应用图标作为导航 */
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+
+        addPreferencesFromResource(R.xml.preferences); // 加载偏好资源
+        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY); // 获取账户类别偏好
+        mReceiver = new GTaskReceiver(); // 初始化广播接收器
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME); // 设置广播动作
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.TIRAMISU) {
+            registerReceiver(mReceiver, filter, Context.RECEIVER_NOT_EXPORTED); // 注册广播接收器（API 33及以上）
+        } else {
+            registerReceiver(mReceiver, filter); // 注册广播接收器（API 33以下）
+        }
+
+        mOriAccounts = null; // 初始化原始账户数组
+        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null); // 加载设置头部布局
+        getListView().addHeaderView(header, null, true); // 添加头部视图到列表视图
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        // 如果用户已添加新账户，则自动设置同步账户
+        if (mHasAddedAccount) {
+            Account[] accounts = getGoogleAccounts(); // 获取所有Google账户
+            if (mOriAccounts != null && accounts.length > mOriAccounts.length) { // 检查是否有新增账户
+                for (Account accountNew : accounts) {
+                    boolean found = false;
+                    for (Account accountOld : mOriAccounts) {
+                        if (TextUtils.equals(accountOld.name, accountNew.name)) { // 比较账户名
+                            found = true;
+                            break;
+                        }
+                    }
+                    if (!found) { // 如果未找到匹配账户
+                        setSyncAccount(accountNew.name); // 设置同步账户
+                        break;
+                    }
+                }
+            }
+        }
+
+        refreshUI(); // 刷新用户界面
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (mReceiver != null) {
+            unregisterReceiver(mReceiver); // 注销广播接收器
+        }
+        super.onDestroy();
+    }
+
+    private void loadAccountPreference() {
+        mAccountCategory.removeAll(); // 清空账户类别中的所有偏好
+
+        Preference accountPref = new Preference(this); // 创建新的偏好项
+        final String defaultAccount = getSyncAccountName(this); // 获取默认同步账户名
+        accountPref.setTitle(getString(R.string.preferences_account_title)); // 设置标题
+        accountPref.setSummary(getString(R.string.preferences_account_summary)); // 设置摘要
+        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() { // 设置点击监听器
+            public boolean onPreferenceClick(Preference preference) {
+                if (!GTaskSyncService.isSyncing()) { // 如果未处于同步状态
+                    if (TextUtils.isEmpty(defaultAccount)) { // 如果默认账户为空
+                        showSelectAccountAlertDialog(); // 显示选择账户对话框
+                    } else {
+                        showChangeAccountConfirmAlertDialog(); // 显示更改账户确认对话框
+                    }
+                } else {
+                    Toast.makeText(NotesPreferenceActivity.this,
+                                    R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
+                            .show(); // 显示无法更改账户的提示
+                }
+                return true;
+            }
+        });
+
+        mAccountCategory.addPreference(accountPref); // 将账户偏好添加到类别中
+    }
+
+    private void loadSyncButton() {
+        Button syncButton = (Button) findViewById(R.id.preference_sync_button); // 获取同步按钮
+        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview); // 获取最后同步时间文本视图
+
+        // 根据同步状态设置按钮文本和点击事件
+        if (GTaskSyncService.isSyncing()) {
+            syncButton.setText(getString(R.string.preferences_button_sync_cancel)); // 设置取消同步文本
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this); // 取消同步
+                }
+            });
+        } else {
+            syncButton.setText(getString(R.string.preferences_button_sync_immediately)); // 设置立即同步文本
+            syncButton.setOnClickListener(new View.OnClickListener() {
+                public void onClick(View v) {
+                    GTaskSyncService.startSync(NotesPreferenceActivity.this); // 开始同步
+                }
+            });
+        }
+        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this))); // 禁用无账户时的同步按钮
+
+        // 设置最后同步时间
+        if (GTaskSyncService.isSyncing()) {
+            lastSyncTimeView.setText(GTaskSyncService.getProgressString()); // 设置同步进度文本
+            lastSyncTimeView.setVisibility(View.VISIBLE); // 显示同步进度视图
+        } else {
+            long lastSyncTime = getLastSyncTime(this); // 获取最后同步时间
+            if (lastSyncTime != 0) {
+                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
+                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
+                                lastSyncTime))); // 设置最后同步时间文本
+                lastSyncTimeView.setVisibility(View.VISIBLE); // 显示最后同步时间视图
+            } else {
+                lastSyncTimeView.setVisibility(View.GONE); // 隐藏最后同步时间视图
+            }
+        }
+    }
+
+    private void refreshUI() {
+        loadAccountPreference(); // 刷新账户偏好
+        loadSyncButton(); // 刷新同步按钮
+    }
+
+    private void showSelectAccountAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); // 创建对话框构建器
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null); // 加载对话框标题布局
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title); // 获取标题文本视图
+        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title)); // 设置标题文本
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle); // 获取副标题文本视图
+        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips)); // 设置副标题文本
+
+        dialogBuilder.setCustomTitle(titleView); // 设置自定义标题
+        dialogBuilder.setPositiveButton(null, null); // 移除默认的确定按钮
+
+        Account[] accounts = getGoogleAccounts(); // 获取所有Google账户
+        String defAccount = getSyncAccountName(this); // 获取默认同步账户名
+
+        mOriAccounts = accounts; // 更新原始账户数组
+        mHasAddedAccount = false; // 重置账户添加标志
+
+        if (accounts.length > 0) { // 如果存在账户
+            CharSequence[] items = new CharSequence[accounts.length]; // 创建选项数组
+            final CharSequence[] itemMapping = items; // 保存选项映射
+            int checkedItem = -1; // 默认未选中
+            int index = 0; // 当前索引
+            for (Account account : accounts) { // 遍历账户
+                if (TextUtils.equals(account.name, defAccount)) { // 如果账户名匹配默认账户
+                    checkedItem = index; // 设置选中项
+                }
+                items[index++] = account.name; // 添加账户名到选项数组
+            }
+            dialogBuilder.setSingleChoiceItems(items, checkedItem, // 设置单选列表
+                    new DialogInterface.OnClickListener() {
+                        public void onClick(DialogInterface dialog, int which) {
+                            setSyncAccount(itemMapping[which].toString()); // 设置同步账户
+                            dialog.dismiss(); // 关闭对话框
+                            refreshUI(); // 刷新用户界面
+                        }
+                    });
+        }
+
+        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null); // 加载添加账户视图
+        dialogBuilder.setView(addAccountView); // 设置视图
+
+        final AlertDialog dialog = dialogBuilder.show(); // 显示对话框
+        addAccountView.setOnClickListener(new View.OnClickListener() { // 设置添加账户点击事件
+            public void onClick(View v) {
+                mHasAddedAccount = true; // 标记已添加账户
+                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS"); // 创建添加账户意图
+                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] { "gmail-ls" }); // 设置权限过滤器
+                startActivityForResult(intent, -1); // 启动添加账户活动
+                dialog.dismiss(); // 关闭对话框
+            }
+        });
+    }
+
+    private void showChangeAccountConfirmAlertDialog() {
+        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this); // 创建对话框构建器
+
+        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null); // 加载对话框标题布局
+        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title); // 获取标题文本视图
+        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
+                getSyncAccountName(this))); // 设置标题文本
+        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle); // 获取副标题文本视图
+        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg)); // 设置副标题文本
+        dialogBuilder.setCustomTitle(titleView); // 设置自定义标题
+
+        CharSequence[] menuItemArray = new CharSequence[] { // 定义菜单项数组
+                getString(R.string.preferences_menu_change_account),
+                getString(R.string.preferences_menu_remove_account),
+                getString(R.string.preferences_menu_cancel)
+        };
+        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() { // 设置菜单项点击事件
+            public void onClick(DialogInterface dialog, int which) {
+                if (which == 0) { // 如果选择更改账户
+                    showSelectAccountAlertDialog(); // 显示选择账户对话框
+                } else if (which == 1) { // 如果选择移除账户
+                    removeSyncAccount(); // 移除同步账户
+                    refreshUI(); // 刷新用户界面
+                }
+            }
+        });
+        dialogBuilder.show(); // 显示对话框
+    }
+
+    private Account[] getGoogleAccounts() {
+        AccountManager accountManager = AccountManager.get(this); // 获取账户管理器
+        return accountManager.getAccountsByType("com.google"); // 获取所有Google账户
+    }
+
+    private void setSyncAccount(String account) {
+        if (!getSyncAccountName(this).equals(account)) { // 如果账户不同
+            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); // 获取共享偏好
+            SharedPreferences.Editor editor = settings.edit(); // 获取编辑器
+            if (account != null) { // 如果账户不为空
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account); // 保存账户名
+            } else {
+                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, ""); // 清空账户名
+            }
+            editor.commit(); // 提交更改
+
+            // 清理最后同步时间
+            setLastSyncTime(this, 0);
+
+            // 清理本地任务相关数据
+            new Thread(new Runnable() {
+                public void run() {
+                    ContentValues values = new ContentValues(); // 创建内容值对象
+                    values.put(NoteColumns.GTASK_ID, ""); // 清空任务ID
+                    values.put(NoteColumns.SYNC_ID, 0); // 清空同步ID
+                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null); // 更新数据库
+                }
+            }).start();
+
+            Toast.makeText(NotesPreferenceActivity.this,
+                    getString(R.string.preferences_toast_success_set_accout, account), // 显示成功设置账户的提示
+                    Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private void removeSyncAccount() {
+        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); // 获取共享偏好
+        SharedPreferences.Editor editor = settings.edit(); // 获取编辑器
+        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) { // 如果包含同步账户名
+            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME); // 移除同步账户名
+        }
+        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) { // 如果包含最后同步时间
+            editor.remove(PREFERENCE_LAST_SYNC_TIME); // 移除最后同步时间
+        }
+        editor.commit(); // 提交更改
+
+        // 清理本地任务相关数据
+        new Thread(new Runnable() {
+            public void run() {
+                ContentValues values = new ContentValues(); // 创建内容值对象
+                values.put(NoteColumns.GTASK_ID, ""); // 清空任务ID
+                values.put(NoteColumns.SYNC_ID, 0); // 清空同步ID
+                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null); // 更新数据库
+            }
+        }).start();
+    }
+
+    public static String getSyncAccountName(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); // 获取共享偏好
+        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, ""); // 返回同步账户名
+    }
+
+    public static void setLastSyncTime(Context context, long time) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); // 获取共享偏好
+        SharedPreferences.Editor editor = settings.edit(); // 获取编辑器
+        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time); // 保存最后同步时间
+        editor.commit(); // 提交更改
+    }
+
+    public static long getLastSyncTime(Context context) {
+        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE); // 获取共享偏好
+        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0); // 返回最后同步时间
+    }
+
+    private class GTaskReceiver extends BroadcastReceiver { // 广播接收器内部类
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            refreshUI(); // 刷新用户界面
+            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) { // 如果正在同步
+                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview); // 获取同步状态文本视图
+                syncStatus.setText(intent
+                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG)); // 设置同步进度文本
+            }
+
+        }
+    }
+
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case android.R.id.home: // 如果点击返回按钮
+                Intent intent = new Intent(this, NotesListActivity.class); // 创建笔记列表意图
+                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); // 设置清除顶部标志
+                startActivity(intent); // 启动笔记列表活动
+                return true;
+            default:
+                return false;
+        }
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/widget/NoteWidgetProvider.java

@@ -0,0 +1,142 @@
+package net.micode.xiaomi_note.widget;
+
+import android.app.PendingIntent;
+import android.appwidget.AppWidgetManager;
+import android.appwidget.AppWidgetProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.util.Log;
+import android.widget.RemoteViews;
+
+import net.micode.xiaomi_note.R;
+import net.micode.xiaomi_note.data.Notes;
+import net.micode.xiaomi_note.data.Notes.NoteColumns;
+import net.micode.xiaomi_note.tool.ResourceParser;
+import net.micode.xiaomi_note.ui.NoteEditActivity;
+import net.micode.xiaomi_note.ui.NotesListActivity;
+
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+
+    // 定义查询笔记小部件信息时需要的列名数组
+    public static final String [] PROJECTION = new String [] {
+            NoteColumns.ID,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.SNIPPET
+    };
+
+    // 定义列索引常量
+    public static final int COLUMN_ID           = 0;   // 笔记ID列索引
+    public static final int COLUMN_BG_COLOR_ID  = 1;   // 背景颜色ID列索引
+    public static final int COLUMN_SNIPPET      = 2;   // 笔记片段列索引
+
+    private static final String TAG = "NoteWidgetProvider"; // 日志标签
+
+    /**
+     * 当小部件被删除时调用的方法，更新数据库中对应的小部件ID为无效值
+     */
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        ContentValues values = new ContentValues(); // 用于存储要更新的数据
+        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); // 设置无效的小部件ID
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            context.getContentResolver().update(Notes.CONTENT_NOTE_URI, // 更新笔记内容URI
+                    values,
+                    NoteColumns.WIDGET_ID + "=?", // 条件：小部件ID匹配
+                    new String[] { String.valueOf(appWidgetIds[i])}); // 参数：当前小部件ID
+        }
+    }
+
+    /**
+     * 查询指定小部件ID对应的笔记信息
+     */
+    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+        return context.getContentResolver().query(Notes.CONTENT_NOTE_URI, // 查询笔记内容URI
+                PROJECTION, // 查询的列
+                NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?", // 查询条件
+                new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) }, // 参数
+                null); // 不排序
+    }
+
+    /**
+     * 更新小部件视图的方法，调用具体的更新实现
+     */
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        update(context, appWidgetManager, appWidgetIds, false); // 默认非隐私模式
+    }
+
+    /**
+     * 具体的小部件更新逻辑，支持隐私模式
+     */
+    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+                        boolean privacyMode) {
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) { // 检查小部件ID是否有效
+                int bgId = ResourceParser.getDefaultBgId(context); // 获取默认背景ID
+                String snippet = ""; // 初始化笔记片段为空字符串
+                Intent intent = new Intent(context, NoteEditActivity.class); // 创建编辑笔记的意图
+                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); // 设置意图标志
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]); // 添加小部件ID
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType()); // 添加小部件类型
+
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]); // 查询笔记信息
+                if (c != null && c.moveToFirst()) { // 如果查询结果存在且可以移动到第一条记录
+                    if (c.getCount() > 1) { // 如果有多条记录
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]); // 记录错误日志
+                        c.close(); // 关闭游标
+                        return; // 返回不继续执行
+                    }
+                    snippet = c.getString(COLUMN_SNIPPET); // 获取笔记片段
+                    bgId = c.getInt(COLUMN_BG_COLOR_ID); // 获取背景颜色ID
+                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID)); // 添加笔记ID
+                    intent.setAction(Intent.ACTION_VIEW); // 设置意图动作
+                } else { // 如果没有查询到笔记信息
+                    snippet = context.getResources().getString(R.string.widget_havenot_content); // 设置默认文本
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 设置意图动作
+                }
+
+                if (c != null) {
+                    c.close(); // 关闭游标
+                }
+
+                // 创建远程视图对象
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId)); // 设置背景图片
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId); // 添加背景ID到意图
+
+                /**
+                 * 生成点击小部件时触发的PendingIntent
+                 */
+                PendingIntent pendingIntent = null;
+                if (privacyMode) { // 如果是隐私模式
+                    rv.setTextViewText(R.id.widget_text, context.getString(R.string.widget_under_visit_mode)); // 设置文本
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT); // 创建跳转到笔记列表的PendingIntent
+                } else { // 非隐私模式
+                    rv.setTextViewText(R.id.widget_text, snippet); // 设置笔记片段文本
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT); // 创建跳转到笔记编辑页面的PendingIntent
+                }
+
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent); // 将PendingIntent绑定到文本视图
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv); // 更新小部件视图
+            }
+        }
+    }
+
+    /**
+     * 抽象方法：获取背景资源ID
+     */
+    protected abstract int getBgResourceId(int bgId);
+
+    /**
+     * 抽象方法：获取布局ID
+     */
+    protected abstract int getLayoutId();
+
+    /**
+     * 抽象方法：获取小部件类型
+     */
+    protected abstract int getWidgetType();
+}

src/app/src/main/java/net/micode/xiaomi_note/widget/NoteWidgetProvider_2x.java

@@ -0,0 +1,39 @@
+// NoteWidgetProvider_2x.java 文件
+// 该类继承自 NoteWidgetProvider，用于处理 2x 尺寸的小米便签小组件的功能。
+
+package net.micode.xiaomi_note.widget; // 定义包名，存放与小米便签小组件相关的类
+
+// 导入必要的 Android 和项目内部的类
+import android.appwidget.AppWidgetManager; // 提供对 App Widget 的管理功能
+import android.content.Context; // 提供对应用程序上下文的操作
+
+// 导入项目内部资源和工具类
+import net.micode.xiaomi_note.R; // 包含应用的资源 ID
+import net.micode.xiaomi_note.data.Notes; // 包含便签数据模型
+import net.micode.xiaomi_note.tool.ResourceParser; // 提供资源解析功能
+
+public class NoteWidgetProvider_2x extends NoteWidgetProvider { // 定义 2x 尺寸的便签小组件提供者
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 覆写 onUpdate 方法，当小组件被更新时调用
+        super.update(context, appWidgetManager, appWidgetIds); // 调用父类方法执行通用更新逻辑
+    }
+
+    @Override
+    protected int getLayoutId() {
+        // 覆写获取布局 ID 的方法，返回 2x 尺寸的布局文件 ID
+        return R.layout.widget_2x; // 返回 2x 尺寸的布局资源 ID
+    }
+
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 覆写获取背景资源 ID 的方法，根据传入的背景 ID 获取对应的 2x 尺寸背景资源
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId); // 调用工具类方法解析背景资源
+    }
+
+    @Override
+    protected int getWidgetType() {
+        // 覆写获取小组件类型的抽象方法，返回 2x 尺寸的便签类型
+        return Notes.TYPE_WIDGET_2X; // 返回 2x 尺寸的便签类型常量
+    }
+}

src/app/src/main/java/net/micode/xiaomi_note/widget/NoteWidgetProvider_4x.java

@@ -0,0 +1,38 @@
+// NoteWidgetProvider_4x.java 文件
+// 该类继承自 NoteWidgetProvider，用于处理 4x 尺寸的小米便签小组件的功能。
+
+package net.micode.xiaomi_note.widget; // 定义包名，存放与小米便签小组件相关的类
+
+// 导入必要的 Android 和自定义类
+import android.appwidget.AppWidgetManager; // 提供对 App Widget 的管理功能
+import android.content.Context; // 提供应用程序上下文信息
+
+// 导入项目中定义的资源和工具类
+import net.micode.xiaomi_note.R; // 包含应用的资源 ID
+import net.micode.xiaomi_note.data.Notes; // 包含便签数据模型
+import net.micode.xiaomi_note.tool.ResourceParser; // 提供资源解析功能
+
+public class NoteWidgetProvider_4x extends NoteWidgetProvider { // 定义一个继承自 NoteWidgetProvider 的类
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 重写 onUpdate 方法，当小组件被更新时触发
+        super.update(context, appWidgetManager, appWidgetIds); // 调用父类的更新逻辑
+    }
+
+    protected int getLayoutId() {
+        // 返回 4x 尺寸小组件的布局资源 ID
+        return R.layout.widget_4x; // 返回值为 widget_4x 布局文件的资源 ID
+    }
+
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 根据背景 ID 获取对应的 4x 尺寸小组件背景资源 ID
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId); // 调用工具类方法解析背景资源
+    }
+
+    @Override
+    protected int getWidgetType() {
+        // 返回当前小组件的类型，表示这是一个 4x 尺寸的便签小组件
+        return Notes.TYPE_WIDGET_4X; // 返回常量值，标识小组件类型
+    }
+}

src/app/src/main/res/color/primary_text_dark.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:state_pressed="true" android:color="#88555555" />
+  <item android:state_selected="true" android:color="#ff999999" />
+  <item android:color="#ff000000" />
+</selector>

src/app/src/main/res/color/secondary_text_dark.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item android:color="#50000000" />
+</selector>